Among seven persons A, B, C, D, E, F and G, each having a different weight, E is the second lightest person. G is heavier than exactly three persons. A is heavier than only two persons, and F is lighter than only two persons. The weight of C is lighter than D and heavier than F. How many persons are lighter than D?

Correct answer: 3

Solution

E is 2nd lightest, G is 4th lightest, A is 3rd heaviest, and F is 3rd lightest. This forces the order to be E, F, A, G, C, D, B or equivalent consistent ranking, where D is 4th from the top. Therefore, three persons are lighter than D.

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