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Q.

A man can do a piece of work in 10 days but with the assistance of his son, the work is done in 8 days. In how many days, his son alone can do the same piece of work?

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a

15 days

b

22 days

c

30 days

d

40 days

answer is D.

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Detailed Solution

(Man+ Son)'s one day's work=18

Man's one day's work=110

 Son's one day's work =18110=140

 Son can do it in 40 days

 

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