Q2 of 47 Page 174

A man can do a piece of work in 5 days. He and his son working together can finish it in 3 days. In how many days can the son do it alone?

Number of days the man requires to do a piece of work : 5 days


Let Number of days his son requires to do a piece of work : X days


Number of days required by the man and his son together to do a piece of work : 3 days


Work done by the man in one hour:


Work done by his son in one hour:


Work done by the man and his Son together in a one hour :


Work done by the man and his son together in one hour : = =



⇒ 3X + 15 = 5X


⇒ 2X = 15


⇒ X = = days


Son alone can do the work days.

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