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Sergio [31]
4 years ago
12

Suppose stamps for postcards cost $0.28 and stamps for first-class letters cost $0.44. Diego wanted to send postcards and letter

s to 10 friends. If he had $3.60 for stamps and spends it all, how many postcards and how many letters could he send?
Business
1 answer:
erik [133]4 years ago
8 0

Answer:

5 ; 5

Explanation:

Let us assume that the postcard be X

And the letters be Y

So there are two equations which are presented below:

X + Y = 10  - equation 1

$0.28X + $0.44Y = $3.60  - equation 2

Now we simplify the equation 2 by multiplying with the 100 and dividing by 4

7X + 11Y = $90

Now we substitution the both equations

X + Y = 10

7X + 11Y = $90

Multiplied by 7 in first equation

So,

7X + 7Y = 70

7X + 11Y = $90

4Y = 20

Y = 5

As we know

X + Y = 10

So, X would be

= 10 - 5

= 5

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3 years ago
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Assuming a country's economy maintains an 8% rate of growth, young adults starting at age 20 would see the average standard of l
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The U.S. stock market has returned an average of about 9% per year since 1900. This return works out to a real return (i.e., adj
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Answer:

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Giving the following information:

The U.S. stock market has returned an average of about 9% per year since 1900.

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