Sis : you : bro
10 : 9 : ?
? ? : 27 : 29
We can get the 9 at the top to 27, by multiplying the whole row by 3 to get:
30 : 27 :?
? : 27 : 29
Your age matches (in the ratios or relation to your sis & bro) now 27 yrs in both ratio. Creating a single ratio, whereby multiplying the top row by 3 to get you to 27 & bottom row by 1 to get you to 27. Knowing when you're 27 in both cases, you know how old your sis & bro is
So, replace the ? with the number above or below it, creating a single ratio, where you are in common with both, by being 27 in both cases.
The ratio of sis : you : bro is now -
The ratio of sis : you : bro is now - 30: 27 : 29
To find what your age is we need to increase the ratio in the same amount to find your maximum age under 70.
So, if we were to double your age to 54, by multiplying your previous age of 27 by 2. We've got to do the same for your sis & bro too, they're aging with you.
We get :
We get :60 : 54 : 58
(30 x 2) : (27 x2) : (29 x2)
Keep increasing the ratio, to the point you're not above 70 years. Now, I'll multiply all ages by 3.
30: 27 : 29
(30 x 3) : ( 27 x 3) : (29 x 3)
We get:
We get:90 : 81 : 87
Right now, you're above the age of 70.
Thus, your maximum age must be 54, where you're under 70 years, but over 40 years.
Answer : 54 years
Hope this helps!
ASAP help me with this PLEASE
Answer:
16
Step-by-step explanation:
By the trapezoid midsegment theorem,
[tex]\frac{ST+6}{2}=11 \\ \\ ST+6=22 \\ \\ ST=16[/tex]
[tex] \qquad \qquad \bf \huge\star \: \: \large{ \underline{Answer} } \huge \: \: \star[/tex]
ST = 16 units[tex]\textsf{ \underline{\underline{Steps to solve the problem} }:}[/tex]
We can use Trapezoid midsegment property:
[tex] \qquad❖ \: \sf \: \dfrac{ST + QR}{2} = LM[/tex]
[tex] \qquad❖ \: \sf \: \dfrac{ST + 6}{2} = 11[/tex]
[tex] \qquad❖ \: \sf \: {ST + 6} =2 \times 11[/tex]
[tex] \qquad❖ \: \sf \: {ST + 6} =22[/tex]
[tex] \qquad❖ \: \sf \: {ST } =22 - 6[/tex]
[tex] \qquad❖ \: \sf \: {ST } =16[/tex]
[tex] \qquad \large \sf {Conclusion} : [/tex]
Length of segment 164- Evaluating Expressions
11) (2 + y - x); use x = 4 and y = 6
13) P(+²); use a = 7 and p=6
6
5-Solving Inequalities
16) 1 ≤
10 11 12
18) 6v> 54
13 14 15 16 17 18
8 9 10 11 12 15 14 15 16 17 18
12)3(8a-5b)-2(a + b); use a = 3 and b = 2
14) 3m-2+
use m = 5 and n = 6
17) 20
19) 82/2
4
14 15 16 17 15
9 10 11 12
14 15 16 17 15
Answer:
The answer is 4'
Step-by-step explanation:
The answer is 4, 123456789, 6 12, 18, 24, 30, 36, 42, 48.
If BC= 48 cm and sin
Using relations in a right triangle, it is found that the length of AC is of 14 cm.
What are the relations in a right triangle?The relations in a right triangle are given as follows:
The sine of an angle is given by the length of the opposite side to the angle divided by the length of the hypotenuse.The cosine of an angle is given by the length of the adjacent side to the angle divided by the length of the hypotenuse.The tangent of an angle is given by the length of the opposite side to the angle divided by the length of the adjacent side to the angle.Researching this problem on the internet, we have that:
The opposite leg to angle A is of 48 cm.sin(A) = 0.96.Hence the hypotenuse is found as follows:
sin(A) = 48/h
0.96 = 48/h
h = 48/0.96
h = 50 cm.
The length of side AC is the other leg of the triangle, found using the Pythagorean Theorem, hence:
[tex]x^2 + 48^2 = 50^2[/tex]
[tex]x^2 = \sqrt{50^2 - 48^2}[/tex]
x = 14 cm.
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Solve for the following equation
9/4x + 1/3 = 5/2x
Answer:
3/4
Step-by-step explanation:
plug values in for x till you get it right
Find the value of 11 P 3
When a set of given numbers or items is to be arranged in a definite way or pattern, permutation can be used to determine the number of ways in which this can be done. Thus the required answer to the question is 990.
When a set of given numbers or items is to be arranged in a definite way or pattern, permutation can be used to determine the number of ways in which this can be done. The applicable formula is:
[tex]_{n} P_{r}[/tex] = [tex]\frac{n!}{(n - r)!}[/tex]
where: n is the total number of items given, and r is the number of items selected.
Thus the given question can be solved as :
[tex]_{11} P_{3}[/tex] = [tex]\frac{11!}{(11-3)!}[/tex]
= [tex]\frac{11!}{8!}[/tex]
= [tex]\frac{11 * 10 * 9 * 8!}{8!}[/tex]
= 11 x 10 x 9
= 990
[tex]_{11} P_{3}[/tex] = 990
Therefore, the required answer is 990.
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A pitaya, or dragon fruit, is a tropical fruit with pink skin and pulp filled with tiny black
seeds. The weight of a pitaya seed is 1 x 107 ounce. What is the weight of the pitaya
seed in standard form?
Type the number in the box.
oz
The standard form the weight of a pitaya seed is 1 x 10⁷ ounces.
What is a standard form?Any value between 1.0 and 10.0 that can be expressed as a decimal number and multiplied by a power of 10 is referred to as being in standard form. If you look closely, you will see that 1.23 is a decimal between 1.0 and 10.0, and as a result, we have the standard form of 123,000,000 as 1.23 x 10⁸.
Given that a pitaya, or dragon fruit, is a tropical fruit with pink skin and pulp filled with tiny black seeds. The weight of a pitaya seed is 1 x 10⁷ ounces.
The standard form can be written as:-
Weight = 10000000 ounces
Weight = 1 x 10⁷ ounces.
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(y-5)/2=(y+6)/3 solve
The solution of the given equation represented in the task content can be determined by first evaluating the LCM and hence is; y= 27.
What is the solution of the equation as given in the task?The given equation is; (y-5)/2=(y+6)/3.
Hence, by multiplying the equation by 6, we have;
3(y-5) = 2(y+6)
3y -15 = 2y +12
y = 27.
Hence, it follows that the value of y which is a solution to the equation is; y = 27.
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A plant is 30cm tall when planted in a garden it increases by 10 percent each week how long will it take to reach 1 meter
Answer:
12.63 weeks ~~ 13 weeks
Step-by-step explanation:
This is much like a banking question with compounded interest
FV = PV ( 1 + i)^n FV = Future value = 1 m PV = present value = .3
i = periodic interest = .10 n = periods
1 = .3(1 + .1)^n solve for n = the number of weeks
1/.3 = 1.1^n
log (1/.3) / log 1.1 = n = 12.63 weeks
Proofs whole page for 50 points ( serious answers only or report and 1 star )
1) Given - It is given in the problem
2) Corresponding Angles Postulate - If a transversal (line l) intersects two parallel lines (line h and line g), then the corresponding angles must be equal.
3) Transitive Property of Congruence - Since it's given that [tex]\angle1\cong\angle5[/tex] and we showed in line 2 that [tex]\angle1\cong\angle2[/tex], it should be true that [tex]\angle2\cong\angle5[/tex]
4) Converse of Corresponding Angles Postulate - If a transversal (line g) intersects two lines (lines l and m), and the corresponding angles that form have equal measure, then the lines are parallel.
Question 2:1) Given - It is given in the problem
2) Definition of Angle Bisector - It's given that [tex]\overline{DC}[/tex] bisects [tex]\angle BDE[/tex], which means that [tex]\overline{DC}[/tex] is the angle bisector, and the angle is divided into two angles of the same measure.
3) Transitive Property of Congruence - Since we showed in line 2 that [tex]\angle1\cong\angle2[/tex] and its given that [tex]\angle2\cong\angle3[/tex], it should be true that [tex]\angle1\cong\angle3[/tex]
4) Converse of the Alternate Interior Angles Theorem - If a transversal ([tex]\overline{BD}[/tex]) intersects two lines ([tex]\overline{AB}[/tex] and [tex]\overline{CD}[/tex]) and the alternate interior angles formed have the same measure, then the lines are parallel.
Cual es el valor de x+6=15
Answer: 9
Step-by-step explanation: it is what it is
15-6=9 omg i never knew
Determine the following values: (−4), (0), (4), (6), (8)
b) On what intervals is () increasing? Decreasing?
c) On what open intervals is () concave up and decreasing?
d) For what values of , if any, does () have points of inflection?
e) Find the equation of tangent line to () at = 6.
f) Determine the range of ().
g) Draw the graph of ().
2. Let ℎ() = (3).
a) Evaluate
lim→2
ℎ()/ − 2
.
b) Find the equation of the tangent line to ℎ() at = 1.
c) Find ℎ′(0).
(a) g(- 4) ≈ - 20.566, g(0) = - 8, g(4) = 4, g(6) = 0, g(8) = - 4
(b) g(x) is increasing in the interval [- 4, 2] and decreasing in the interval [4, 8].
(c) There is an up concavity and a decreasing behavior in the interval [2, 6].
(d) The points x = 2 and x = 6 are points of inflection of g(x).
(e) The equation of the line tangent to g(x) at x = 6 is y = - 4 · x + 24.
(f) The range of g(x) is [- 20.566, 4].
(g) The graph of g(x) is shown in the picture attached below.
How to analyze the integral of a piecewise defined function
In this problem we have a piecewise defined function formed by four functions, a circle-like function and three lines, whose integral has to be analyzed in all its characteristics. (a) The integral is described graphically by the area below the curve, where g(2) = 0 and the following properties of the integral are used:
g(- 4) = g(2) - [F(2) - F(- 4)]
g(- 4) = 0 - 0.25π · 4² - 4 · 2
g(- 4) ≈ - 20.566
g(0) = g(2) - [F(2) - F(0)]
g(0) = 0 - 4 · 2
g(0) = - 8
g(4) = g(2) + [F(4) - F(2)]
g(4) = 0 + 0.5 · (2) · (4)
g(4) = 4
g(6) = g(2) + [F(6) - F(2)]
g(6) = 0 + 0.5 · (2) · (4) - 0.5 · (2) · (4)
g(6) = 0
g(8) = g(2) + [F(8) - F(2)]
g(8) = 0 + 0.5 · (2) · (4) - (2) · (4)
g(8) = - 4
(b) An interval of g(x) is increasing when f(x) > 0 and decreasing when f(x) < 0. Thus, g(x) is increasing in the interval [- 4, 2] and decreasing in the interval [4, 8].
(c) There is an up concavity and a decreasing behavior in the interval [2, 6].
(d) There are points of inflection for values of x such that f'(x) do not exists. The points x = 2 and x = 6 are points of inflection of g(x).
(e) We need to determine the slope and the intercept of the tangent line to determine the equation of the line:
Slope
m = f(6)
m = - 4
Intercept (x = 6, g(x) = 0)
b = g(x) - m · x
b = 0 - (- 4) · 6
b = 24
The equation of the line tangent to g(x) at x = 6 is y = - 4 · x + 24.
(f) The range of g(x) corresponds to the set of values of y that exists in the function. In accordance with the information given in (a), the range of g(x) is [- 20.566, 4].
(g) The graph of g(x) is shown in the picture attached below.
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i need help please!!
Answer:[tex]DB \cong VT[/tex]
Step-by-step explanation:
All 3 sides need to be congruent.
As a cold front approaches the weather forecast over the next 5 days calls for the following temperatures In degrees Fahrenheit 12,5,18,8,2 which graph below represents the temperature over this 5 day period
The graph showing the temperature over the 5-day period will look exactly like the attached. On the y-axis, we have the Temperature and the x-axis the number of days.
What is the value of a Graph forecast?Graphs and charts are useful visual aids because they make information accessible and easy to understand.
Therefore, it is not unexpected that print and electronic media frequently employ graphs.
When data is displayed as a graph rather than a table, it can often be easier to understand since the graph might show a pattern or comparison.
What is the interpretation of the graph?The graph shows the forecasted data against the actual data. It is to be noted that the data for the actual 5-day temperatures are made-up to help the analyst understand the differences between the forecasted and the actual data.
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Help me with this question asap please !
Answer:
BA
CB
CA
Step-by-step explanation:
this simply means that such a letter combination stands for a line that goes through the points with these letters.
and a "ray" means a straight line (not one that goes around a corner). "from this figure" means lines (or connections between points) that are drawn in this graphic.
BA yes
B is just a point, no line. therefore, no.
DBA guys around a corner (from D to B, and then from there to A). therefore, no.
AD would be a straight line, but it is not drawn in the graphic. therefore, no.
ADB is partly not drawn, and it goes around a corner. therefore, no.
CB, CA are both straight lines in the graphic. yes.
A manufacturer has a steady annual demand for 22,638 cases of sugar. It costs $7 to store 1 case for 1 year, $33 in set up cost to produce each batch, and $15 to produce each case. Find the number of cases per batch that should be produced to minimize cost
The number of cases per batch that the manufacturer should produce to minimize cost is 462 cases per batch.
How can inventory costs be minimized?To minimize inventory costs, especially setup and holding costs, the economic order quantity (EOQ) technique is deployed.
The EOQ model refers to the ideal order or batch quantity a company should purchase per order or produce per batch to minimize its inventory costs.
Some of a company's inventory costs include holding costs, shortage costs, setup, and ordering costs.
Using the EOQ model shows the ideal minimum units that the manufacturer should produce per batch to minimize costs.
The EOQ formula is square root of: [2(setup costs)(demand rate)] / holding costs.
Data and Calculations:Annual demand = 22,638 cases
Storage cost per case = $7
Setup cost per batch = $33
Product unit cost = $15 per case
EOQ = square root of: [2(setup costs)(demand rate)] / holding costs.
= square root of 2 x $33 x 22,638/$7
= square root of 213,444
= 462
Number of batches = 49 (22,638/462)
Thus, the number of cases per batch that the manufacturer should produce to minimize cost is 462 cases per batch.
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What is the least common multiple of 6x^2+39x and 6x^2+54x+84?
Answer: 6x[tex]6x{2}+93x-126andx{2}+84[/tex]
Step-by-step explanation: The only thing you do is just to keep multiplying until you get your answer.
which graph represents -5x+3y is equal to or greater than 9
Answer:
First, transform the given equation into the slope intercept form.
-5x + 3y >= 9
3y >= 5x + 9
y >= 5/3x + 3
Then graph the line y = 5/3x + 3. Draw a solid line with y intercept 3 and slope of 5/3.
Finally, shade everything that is above the line.
urgently needing help
Answer:
the answer is 86,016
Step-by-step explanation:
i took the test
Answer:
The answer is 4.
Step-by-step explanation:
8(-1)^4 - 3(-1) - 7
8 + 3 - 7
11 - 7
4
Which of the following is a solution of x² + 5x = -2?
05± √/33
2
5+√17
2
-5± √√33
2
-5± √17
2
Answer:last option -5± √17
2
Step-by-step explanation:
Quadratic equations represent any equation that can be rearranged in standard forma (ax² + bx + c( =0(a, b & c) are known.
Quadratic equations can always be solved using the quadratic formula, but sometimes factoring or isolating the variable is also posible.
In the square equation ax² + bx + c = 0
a = 1 b = 5 c = 2[tex]\boldsymbol{\sf{x=\dfrac{-b\pm\sqrt{\Delta} }{2a} \ ,\Delta=b^{2}-4ac } }[/tex]
Let's calculate the discriminant of the quadratic equation:
∆ = b² - 4ac = 5² - 4 1 2 = 25 - 8 = 17Since the discriminant is greater than zero, then the quadratic equation has two real roots.
[tex]\boldsymbol{\sf{x_{1}=\dfrac{-b-\sqrt{\Delta} }{ 2\cdot a}=\dfrac{-5-\sqrt{17} }{2\cdot1} }}[/tex]
[tex]\boldsymbol{\sf{x_{2}=\dfrac{-b+\sqrt{\Delta} }{ 2\cdot a}=\dfrac{-5+\sqrt{17} }{2\cdot1} }}[/tex]
Solution:
[tex]\boldsymbol{\sf{x=\dfrac{-5\pm\sqrt{17} }{2} }}[/tex]
ヘ( ^o^)ノ＼(^_^ )If you want to learn more about mathematics, I share this link to complement your learning:
https://brainly.com/question/17016723if two vertical angles are 2x-10 and x+20 find the value of x
Answer:
x=70
Step-by-step explanation:
when added together, verticle angles equal 180 degrees.
2x-10+x+20=180
3x-10+20=180
3x-30=180
3x=210
x=70
In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation in statistical polling is the margin of error - the largest (reasonble) error that the poll could have. For example, a poll result of 72% with a margin of error of 4% indicates that p is most likely to be between 68% and 76% (72% minus 4% to 72% plus 4%).
In a (made-up) poll, the proportion of people who like dark chocolate more than milk chocolate was 43% with a margin of error of 1.9%. Describe the conclusion about p using an absolute value inequality.
The answer field below uses the symbolic entry option in Mobius. That lets you type in a vertical bar | to represent absolute values. Also, when you type in << and then, the symbolic entry option will automatically convert that to <.I the same way, if you type in> and then, the symbolic entry option will automatically convert that to >
Be sure to use decimal numbers in your answer (such as using 0.40 for 40%).
The absolute value inequality is given as |(p - 0.43)I ≤ 0.019
How to describe the proportion using the absolute value inequalityThe proportion p = 43% = 0.43
Margin of error = 1.9% = 0.019
The value of the proportion can then be said to lie between
(0.43 - 0.019) ≤ p ≤ (0.43 + 0.019)
In order to convert to the absolute inequality we would be having
-0.019 ≤ (p - 0.43) ≤ 0.019
I (p - 0.43)I ≤ 0.019
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19 ft
4 ft
l
Find l.
l = √ [?] ft
Answer :LF is the abbreviation for linear feet Sq ft is the abbreviation for square feet L – lenght (e.g. room length) W – width (e.g. room width)
Liters to Cubic Feet formula. ft³ =. L * 0.035315. Show working Show result in exponential format More information: Cubic Feet.
Step-by-step explanation:
Michael Wittry has been investing in his Roth IRA retirement account for 20 years. Two years ago, his account was worth $215,658. After losing of its original value, it then gained of its new value back. What is the current value of his Roth IRA?
The current value of his Roth IRA is $215,658.00
What is Roth IRA retirement account?
Roth IRA retirement account is a retirement account where the contributions to the account are invested after taxes after have been deducted.
In other words, when the individual make contributions, taxes are first of all, deducted so as to invest the after-tax contribution into the Roth IRA account
The account lost 1/3 of its original value of $215,658
balance after the loss=$215,658-(1/3*$215,658)
balance after the loss=$ 143,772.00
Now the account regained 1/2 of its new balance of $ 143,772.00
balance now=$143,772.00+(1/2*$143,772.00)
balance now=$215,658.00
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Complete with the missing fractions:
michael wittry has been investing in his roth IRA retirement account for 20 years. Two years ago his account was worth $215,658. after losing 1/3 of its origiInal value, it then gained 1/2 of its new value back, what is the current value of his roth IRA?
solve this question asap
Answer:
f^-1(x)=x-14
Step-by-step explanation:
change f(x) to y :y=x×14
interchange variables :x=y+14
move constant(14) to the left :x-14=f^-1(x)
Two cyclists start at the same point and travel in opposite directions. One cyclist travels 5 faster than the other. If the two cyclists are 74 miles apart after 2 hours, what is the rate of each cyclist?
The rate of the slower cyclist is 16 mph while the rate of the faster cyclist is 21 mph.
How to calculate the rate of speed?let us assume the following;
x = rate of slower cyclist
x + 5 = rate of faster cyclist
We know that formula for distance is;
distance = travel time*rate
Thus;
2x + 2(x + 5) = 74
Since the two cyclists are a distance of 74 miles apart after a time 2 hours. Thus;
2x + 2x + 10 = 74
4x + 10 = 74
4x = 74 - 10
4x = 64
x = 64/4
x = 16
Rate of faster cyclist = 16 + 5 = 21 mph
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6) Evaluate 3/4x if X = -1/4
Answer: [tex]-\frac{3}{16}[/tex]
Step-by-step explanation:
[tex]\frac{3}{4}(-\frac{1}{4} )[/tex]
multiply the numberator and denominator:
3*-1 = -3
and
4*4 = 16 so,
[tex]-\frac{3}{16}[/tex] is the answer
Answer: [tex]\Large\boxed{-\frac{3}{16} }[/tex]
Step-by-step explanation:
Given information
x = - 1/4
Given expression
[tex]\dfrac{3}{4} ~x[/tex]
Substitute values into the expression
[tex]=\dfrac{3}{4} \times(-\dfrac{1}{4} )[/tex]
[tex]=\dfrac{3\times1}{4\times4}[/tex]
[tex]\Large\boxed{=-\frac{3}{16} }[/tex]
Hope this helps!! :)
Please let me know if you have any questions
Find one possible missing coordinate so that the point becomes a solution to the given inequality. (x, 8) is a solution to 3x - 4 < y. X =
Answer:
x = 0
Step-by-step explanation:
Substituting the given "point" into the equation gives the possibilities for x.
SubstitutionUsing (x, y) = (x, 8), the inequality becomes ...
3x -4 < 8
Solving for x gives ...
3x < 12 . . . . . . . add 4
x < 4 . . . . . . . divide by 3
Any value of x less than 4 will make (x, 8) a solution to the inequality. For example, ...
x = 0 . . . . . . (0, 8) is a solution to the inequality
To maintain essential electricity, a gasoline generator at a Puerto Rico hospital uses 3 gallons of gasoline per hour. a) How many gallons of gas are needed to fuel the generator for 1 full day? 72 2 points b) How much co2 will be produced by running the generator for 1 full day? 2 points
The mass of the CO2 produced IS 630 Kg
What is gasoline?Gasoline is a kind of fuel that is composed mostly of isooctane. In most engines, gasoline is widely used hence the demand for the product is high. We know that the combustion of an alkane (of which gasoline is one) would produce carbon dioxide and water according to a balanced reaction equation.
The balanced reaction equation for the combustion of gasoline is shown in the image attached to this answer.
Since a Puerto Rico hospital uses 3 gallons of gasoline per hour, and there are 24 hours in a day, it the follows that 72 gallons of gasoline are used per day. This 72 gallons is the equivalent of 272.88 L
Now;
Given that the density of gasoline = 748.9 g/L
Mass of gasoline = 748.9 g/L * 272.88 L = 204 Kg
Number of moles of gasoline = 204 * 10^3/114 g/mol = 1789.5 moles
If 2 moles of gasoline produces 16 moles of CO2
1789.5 moles produces 1789.5 moles * 16 moles/2 moles = 14316 moles
Mass of CO2 = 14316 moles * 44 g/mol = 630 Kg
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Sampson has been given the following budget guidelines. If his department’s budget is $50,000, how much can he spend in each budget category? Be sure to list dollars and cents (round to the nearest hundredth).
The amount he can spend on marketing is $8,333.33.
The amount he can spend on supplies is $16,666.67
The amount he can spend on trainings is $12,500
The amount he can spend on travel is $2,500
The amount he can spend on equipment is $10,000
How much can he spend on each category?The amount he can spend on each category can be determined by multiplying the fraction of that category by the total department's budget.
The amount he can spend on marketing : 1/6 x $50,000 = $8,333.33.
The amount he can spend on supplies: 1/3 x $50,000 = $16,666.67
The amount he can spend on trainings: 1/4 x 50,000 = $12,500
The amount he can spend on travel $2: 1/20 x 50,000 = 2,500
The amount he can spend on equipment $: 1/5 x 50,000 = 10,000
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after henry gave away 2/3 of his stamps and ken gave away 3/4 of his the two boys had an equal number of the stamps left. they had 1156 stamps at first how many stamps did they have left altogather
Answer:
See below.
If the correct sum is 1155, then Ken had 495 stamps, and Henry had 660 stamps.
Step-by-step explanation:
Henry had h stamps.
Ken had k stamps.
After giving away 2/3 of his stamps, Henry ended up with 1/3 of his stamps, or h/3.
After giving away 3/4 of his stamps, ken ended up with 1/4 of his stamps, or k/4.
h/3 = k/4
h + k = 1156
4h = 3k
h = 1156 - k
4(1156 - k) = 3k
4624 - 4k = 3k
4624 = 7k
k = 4624/7
Stamps left: 0.25 × 4624/7 = 1156/7
h = 1156 - k
h = 1156 - 4624/7
h = 8092/7 - 4624/7
h = 3468/7 =495.43
Stamps left: 1/3 × 3468/7 = 1156/7
Total number of stamps left: 1156/7 + 1156/7 = 2312/7 = 330.29
The problem is solved correctly, but the numbers given must be incorrect since you cannot have a fraction of a stamp.
