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2014-07-29T21:55:05+05:30

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W1 = avg weight initially
25 * W1 = weight of 25 persons in itially
Let weight of the man who leaves = W
remaining 24 persons weight is = 25 W1 - W
When new man comes in total weight =  25 W1 - W + 70
Average weight of the new set of 25 persons =  (25 W1 - W +70) / 25 
       = W1 + 1        one more than previous average
=> 25W1 - W +70 = 25 W1 + 25
=> W = 45 Kg
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