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Need an answer with some explanation

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Need an answer with some explanation [#permalink] New post 17 Jun 2011, 01:50
1. The current ratio of boys to girls at a certain school is 2to 5. If 12 additional boys were added to the school, the new ratio of boys to girls would be 4 to 9. How many boys currently attend the school?
(A) 27
(B) 48
(C) 54
(D) 72
(E) 108
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Re: Need an answer with some explanation [#permalink] New post 17 Jun 2011, 02:59
b:g = 2:5
5b=2g
(b+12)/g = 4/9
9b+12*9 = 4g
9b+108 = 10b
b= 108
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Re: Need an answer with some explanation [#permalink] New post 17 Jun 2011, 06:40
repost:
boys-to-girls-ratio-93794.html

Same story: search before posting. Also please post in the correct forum.

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Re: Need an answer with some explanation   [#permalink] 17 Jun 2011, 06:40
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