GPREP
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 Senior  Next Rank: 100 Posts
 Posts: 38
 Joined: 08 Nov 2008
Let x be the difference between the salaries of M and K.
Mx+J+x=2K
M+J=2K
K=(M+J)/2
Stmt I
J=30,000 We don't know anything about M and K //insuff
Stmt II
K=40,000 =>
M+J=80,000 =>
M+J+K=120,000 mean=40,000 //suff
Therefore, B
Mx+J+x=2K
M+J=2K
K=(M+J)/2
Stmt I
J=30,000 We don't know anything about M and K //insuff
Stmt II
K=40,000 =>
M+J=80,000 =>
M+J+K=120,000 mean=40,000 //suff
Therefore, B

 Master  Next Rank: 500 Posts
 Posts: 106
 Joined: 22 May 2008
 Thanked: 3 times
One of the equation is mj=2m2k. We can rewrite it as m+j=2k.
question is asking about m+j+k.
statement 1: j=30k. We can't solve the equation with j=30k, therefore insufficient.
statement 2: k=40k, we can solve m+j, which is 80k.
avg.=(40k+80k)/3=40k, therefore sufficient.
question is asking about m+j+k.
statement 1: j=30k. We can't solve the equation with j=30k, therefore insufficient.
statement 2: k=40k, we can solve m+j, which is 80k.
avg.=(40k+80k)/3=40k, therefore sufficient.