A man can do a piece of work in 4 days, but with the help of his son he can do it in 3 days. In what time can the son do it alone ? Answers.
A) 12 days	B) 6 days	C) 5 days	D) 4 days	E) None of these
Explanation:   In this type of question, where we have one person work and together work done. Then we can easily   get the other person work just by subtracting them. 12 dayss   Son's one day work =   (1/3−1/4)=(4−3)/12=1/12   So son will do whole work in 12 days   12 daysnswer: 12 days
<result>A</result>
A man can do a piece of work in 4 days, but with the help of his son he can do it in 3 days. In what time can the son do it alone ?