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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