Six persons - L, M, N, O, P and Q have different weights.
Only P is lighter than L.
Not more than two persons are heavier than M.
Case 1: M > _____ > _____> _____ > L > P
Case 2: ____ > M > _____> _____ > L > P
Case 3: ____ > _____ > M > _____ > L > P
O, whose weight is 80kg, is heavier than M. Thus, case 1 is invalid.
Neither O nor Q is the heaviest person. Thus, case 2 is invalid.
The weight of L is 66kg.
Case 3: ____ > O > M > Q > L > P
Therefore, the final sequence is:
N > O (80kg)> M > Q > L (66kg) > P
O is the second heaviest person. So, N + O = 170kg
O = 80kg.
So, N = 170 - 80 = 90kg.
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