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GMAT Prep?? (Arithmetic Mean) -Mary & Jim


 
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dferm
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PostPosted: Wed May 07, 2008 12:16 pm    Post subject: GMAT Prep?? (Arithmetic Mean) -Mary & Jim Reply with quote
Please Explain...

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amitansu
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PostPosted: Wed May 07, 2008 10:56 pm    Post subject: Reply with quote
From question itself : M-J=2(M-K) =>2K-J=M

We are asked to find (M+J+K)/3
Now putting the values from question => (2K-J+J+K)/3=3K/3=K

From statement 1 : J=30,000

Not sufficient since K's value is not known.

From statement 2 : K's value is given, so sufficient !!
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