Members between club X & Y

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fightthegmat: Senior | Next Rank: 100 Posts; Posts: 31; Joined: Wed Jan 14, 2009 11:45 am; Thanked: 1 times; GMAT Score:600

by fightthegmat » Tue Sep 08, 2009 10:29 am

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 percent are also members of Club Y.
(2) Of the members of Club Y, 30 percent are also members of Club X.

Pls help with the explanation of the solution

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Source: Beat The GMAT — Data Sufficiency | Tue Sep 08, 2009 10:29 am

bharathh: Master | Next Rank: 500 Posts; Posts: 159; Joined: Thu Aug 27, 2009 10:30 am; Thanked: 19 times

by bharathh » Tue Sep 08, 2009 10:48 am

Ans should be C IMO

From statement 1

0.2X = members of Y

Not sufficient on its own as we don't know how many members are in Y

Statement 2

0.3Y = members of X

Insufficient on its own as we don't know how many members are in X

Combining both we know that 0.2X=0.3Y, which means that X has more members. So C

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