The average weight of 12 crewmen in a boat is increased by $1/3$ kg, when one of the crewmen whose weight is 55kg is replaced by a new man. What is the weight of that new man?
Options:
A . 60 kg
B . 58 kg
C . 59 kg
D . 57 kg
Answer: Option C Answer: (c)Weight of the new man = 55 +$1/3$ ×12 = 59 kg. Aliter : Using Rule 18,If in the group of N persons, a new person comes at the place of a person of 'T’ years, so that average age, increases by 't’ years Then, the age of the new person = T + N.t. Here, N = 12, T = 55, t = $1/3$Weight of new man = T + Nt = 55 + 12 ×$1/3$ = 55 + 4 = 59 kg.
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