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by okigbo » Sat Oct 17, 2009 2:07 pm
Is the number of members of Club X greater than the number of members of Club Y?

1. Of the members of Club X, 20% are also members of Club Y

2. Of the members of Club Y, 30% are also members of Club X
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Source: — Data Sufficiency |
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by crackgmat007 » Sat Oct 17, 2009 7:27 pm
C
Rephrase: x > y

1 & 2 individually are not sufficient.

Both
20% X = 30% Y

Solving we get, x = 15/10 Y. We can conclude that X > y

HTH
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by grockit_jake » Mon Oct 19, 2009 9:59 am
Right - there are 3 categories. X alone, Y alone and both X and Y.

It's a standard venn diagram, if visualizing it makes sense to you.

Statement 1 provides the number of Both (B) relative to X and Statement 2 provides the number of B relative to Y.

You can then compare to find the relationship between X and Y.
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