1.

A man can do a piece of work in 5 days, but with the help of his son, he can do it in 3 days. In what time can the son do it alone?

Answer»

7 ½ days



If A and B together can do a piece of work in X days and A alone can do the same work in y 

days, then B alone can do the same work in x y/ y – x days. 

THEREFORE, his son alone can do the work in 3 × 5/ 5 – 3 = 15/2 = 7 ½ days.



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