Average Practice Test 1

Question : 30 of 40

Marks: +1, -0

The average weight of 12 crewmen in a boat is increased by

1/ 3

kg, when one of the crewmen whose weight is 55 kg is replaced by a new man. What is the weight of that new man?

Solution:

Average weight of 12 crewmen = x
Total weight = 12x
According to the statement,

{12x-55+y}/12=x+1/3

Where y is the weight of new crew man.

12x-55+y=12x+4

y=55+4=59\kg

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