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

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Source: — Data Sufficiency |

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by amitansu » Wed May 07, 2008 9:56 pm
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 !!