Multiple choice

The average weight of 10 men in a boat is increased by 1 kg when one of the crew who weighs 50 kg is replaced by a new man. What is the weight of the new man?

  1. 58 kg

  2. 52 kg

  3. 53 kg

  4. 60 kg

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the average of 10 men increases by 1 kg, the total weight increases by 10 x 1 = 10 kg. The new man weighs 10 kg more than the man he replaced (50 kg), so his weight is 60 kg. Option A (58 kg) would only increase the average by 0.8 kg, not the full 1 kg stated.