The average weight of 8 sailors in a boat is increased by 1 kg if one of them weighing 56 kg is replaced by a new sailor. The weight of the new sailor is? Choose the correct choice from the following choices
A) 57 kg  B) 60 kg  C) 64 kg  D) 62 kg  E) 66 kg

Rationale: the sailor weighing 56 kg is replaced and the average is increased by 1 kg . hence , the weight of the new sailor is ( 56 + increase in total weight ) = 56 + 1 x 8 = 56 + 8 = 64 kg . answer : c
Answer: C