The average weight of 20 oarsmen in a boat is increased by 2kg when one of the crew, who weight 40kg is replaced by a new man. Find the weight of the new man.  Choose the most appropriate option.
A) 60 kg  B) 50 kg  C) 92 kg  D) 80 kg  E) 70 kg

Rationale: total weight increased = 2 * 20 = 40 kg weight of the new man = 40 + 40 = 80 kg answer is d
Answer: D