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didieravoaka
- Master | Next Rank: 500 Posts
- Posts: 163
- Joined: Tue Jan 13, 2015 11:44 am
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Hi didieravoaka,
We're told that the ratio of boys to girls is 3:4. Next we're told that there are 5 more girls than boys. We're asked for the number of girls in the club.
Since the ratio is 3 to 4, that means that the number of boys MUST be a multiple of 3 and the number of girls must be an equivalent multiple of 4.
Since the number of girls is only 5 more than the number of boys, we can approach the math in a variety of ways, including 'brute force':
3 boys and 4 girls = 1 more girl
6 boys and 8 girls = 2 more girls
9 boys and 12 girls = 3 more girls
12 boys and 16 girls = 4 more girls
15 boys and 20 girls = 5 more girls
Increasing the number of boys and girls will just increase the difference between them, so we can stop here.
Final Answer: E
GMAT assassins aren't born, they're made,
Rich
