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GMATPill Explanation
As we write out the expressions, we start to see that there is an overlap of members.
20%(ClubX) => Are in ClubY
30%(ClubY) => Are in Club X

Each statement alone has too many unknowns and just one equation. We know that 20% of ClubX members are in ClubY but we don’t know that actual number.

What if we combine them? Hm, well when combined, we come to realize that the overlapping members must be the same number. They are referring to the same thing.

20%(ClubX) = 30%(ClubY)
0.2ClubX = 0.3ClubY
Club X = (0.3/0.2)*ClubY
ClubX = 1.5(ClubY)
We have a relational equation here…ClubX is 1.5 times greater than ClubY. Question solved. Answer used both statements 1 and 2, so it is C.

What is this GMAT question testing?

This question tests laundry lists and the overall positioning of words when it comes to including possessive forms.

Do you say:
“It was the best book ever written by Black Americans.”
or do you say
“It was the best book ever written by a Black American.” ??

Is there even a difference? Well, you better know for the GMAT exam!
Watch the video above to find out!

This question also throws in a few answer choices with the word “being.” Now, all GMAT Pill students know the word “being” is a RED FLAG word. But is it always necessarily bad? Watch the video above to find out!

The key is to figure out what the GMAT guys are testing you on and to move your eyeballs to the critical keywords ASAP so you can do the necessary analysis and choose the correct answer.

How To Think Through This GMAT Prep Question

Go ahead and check out the GMAT Pill video explanation of this Official Guide Question.