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

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The average weight of 12 crewmen in a boat is increased by $$\frac{1}{3}$$ 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 ?

1. A. 58 kg
2. B. 60 kg
3. C. 57 kg
4. D. 59 kg

Average weight of the 12 crewman increased by = $$frac{{1}}{3}$$ kg
eqalign{ & = 12 times frac{1}{3} cr & = 4{text{ kg}} cr}