Boys to Girls Ratio : GMAT Problem Solving (PS)
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# Boys to Girls Ratio

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Manager
Joined: 16 Feb 2010
Posts: 225
Followers: 2

Kudos [?]: 291 [0], given: 16

Boys to Girls Ratio [#permalink]

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06 May 2010, 14:35
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Question Stats:

82% (01:38) correct 18% (03:14) wrong based on 56 sessions

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The current ratio of boys to girls at a certain school is 2 to 5. If 12 additional boys were added to the school, the new ratio fo boys to girls would be 4 to 9. How many boys currenty attend the school?

(A) 27
(B) 48
(C) 54
(D) 72
(E) 108
VP
Joined: 05 Mar 2008
Posts: 1473
Followers: 11

Kudos [?]: 265 [0], given: 31

Re: Boys to Girls Ratio [#permalink]

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06 May 2010, 14:41
zisis wrote:
The current ratio of boys to girls at a certain school is 2 to 5. If 12 additional boys were added to the school, the new ratio fo boys to girls would be 4 to 9. How many boys currenty attend the school?

(A) 27
(B) 48
(C) 54
(D) 72
(E) 108

2x/5x
2x+12/5x = 4/9
18x + 108 = 20x
x = 54
54*2 = 108
Manager
Joined: 16 Feb 2010
Posts: 225
Followers: 2

Kudos [?]: 291 [0], given: 16

Re: Boys to Girls Ratio [#permalink]

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06 May 2010, 15:03
thnks for your VERY quick response
Re: Boys to Girls Ratio   [#permalink] 06 May 2010, 15:03
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# Boys to Girls Ratio

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