I say C
First we look at statement 1, and choose some numbers to plug in and test.
2 for M, and 3 for N.
If we plug in 2 for X, then 4/5 > 2/3
If we plug in -2 for X, then 0/1 < 2/3
Since it can't be solved we cross out A and D
Then we look at statement 2, and choose some numbers to plug in and test.
I've kept X as 2
If M=2 and N=3 then it works as 4/5 > 2/3
But remember to forget statement 1
What if M=3 and N=2, then 5/4 < 3/2
So B doesn't work either.
However if you combine the 2 statements together you see that you do have enough information to solve, therefore the answer is C. Hope that was helpful. And feel free to visit gmat.sg for additional help on your GMAT preparation.
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