The average weight of 8 men is increased by 1.5 kg when one of the men who weighs 65 kg is replaced by a new man. The weight of the new man is:
Explanation:
Let the weight of the person coming in is X kgs.
The average of 8 men increases by 1.5 kg, hence the total weight increases by 8 × 1.5 = 12 kgs.
This is becase the person coming is 12 kgs heavier than the person going out.
∴ X - 65 = 12
⇒ X = 77
Hence, option (d).
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