"In DS, problems always think TWICE before marking C or E. Its a common GMAT problem to give an impression that you need both A and B to solve the problem while you can solve just by using A or B[both integers].

e.g. 2a + 3b = 10

21a + 23b = 67[i don't exactly remember the example]

Its very very easy to mark C as we think that we need 2 equations for 2 unknown variables.

**Try putting values for a and b[if feasible] in equation 2 as only a=1 and b=2 will fit."**
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