math

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The number of boys in a certain class exceed the number of girls by 7. If the number of boys is 5/4 of the number of girls, how many boys are there in the class?

The choices of answers are:

a) 21
b) 28
c) 35
d) 42
e) 63

I figured out that the answer is 35, but I did it by subtracting each of the possible answers by 7 and then multiplying that answer by 5/4.

This is what I did to get my final answer using 35: 35 - 7 = 28; 5/4 X 28/1 = 140/4 which equals 35.

Now, I know there must be a simplier way to get that answer.

Can you show me step by step? Thanks.

  • math -

    B-7=G
    B= 5/4 * G = 5G/4
    5G/4-7=G
    5G-28=4G
    G=28
    B=28+7=35
    G=28

  • math -

    Thanks very much.

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