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Apples and Bananas

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Apples and Bananas

by dtweah » Mon May 25, 2009 3:53 pm
A certain fruit stand sold apples for $.70 each and bananas for $.50 each. If a customer purchased both apples and bananas from the stand for a total of $6.30, what total number of apples and bananas did the customer purchased?

A. 10

B. 11

C. 12

D. 13

E. 14
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by francopiccolo » Mon May 25, 2009 4:09 pm
The customer spent:

0,7A + 0,5B = 6,3 -->
A = (6,3 - 0,5B)/0,7 = 9 - 5/7B

B must be a number such that 5/7B is an integer, then B can be 0, 7, 14, etc.

If B is 0, A is 9. But 9 is not a possible answer.

If B is 7, A is 4 and answer is 11.
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