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Source: — Data Sufficiency |

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by Anju@Gurome » Mon Apr 01, 2013 2:33 am
For two overlapping sets: Total = Elements in set A + Elements in set B - Elements in both set + Elements in neither

In this case, take favorable to M = set A and favorable to N = set B
Now, assume that the number of voters who responded favorable for both candidates = X

So, total voters = favorable to M + favorable to N - X + favorable to none
--> 100 = 40 + 30 - X + favorable to none
--> X = favorable to none - 30

Statement 1: favorable to none = 40

Sufficient

Statement 2: This is not enough to determine N.

Not sufficient.

The correct answer is A.
Anju Agarwal
Quant Expert, Gurome

Backup Methods : General guide on plugging, estimation etc.
Wavy Curve Method : Solving complex inequalities in a matter of seconds.

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