the average weight of 12 crewmen in a boat is increased by 1/3kg. when one of the crewmen whose weight is 55 kg is replaced by a new man. what is the weight of that new man?
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let the average of 12 crewman be X
Total age of crewman = (average×total no. of crewman)
Total age of 12 crewman=12×X
=12X
total age when a man of weight 55left
the boat =12X-55
let the age of new crewman be Y
when he replace the man average increase by 1/3kg
A/Q
12X-55+Y=12(X+1/3)
12X-55+Y=12X+4
Y=12X-12X+4+55
Y= 59
hence the weight of new crewman is 59 kg
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