Question

A doctor can do a piece of work in 6 days, but with the help of his assistant, he can do it in 4 days. In how much time can the assistant do it alone?

• A. 9 days
• B. 10 days
• C. 15 days
• D. 8 days
• E. 12 days

Answer 1

The correct option is E

12 days

Assistant’s 1 day’s work = $(\frac{1}{4}-\frac{1}{6})=\frac{1}{12}$

$\therefore$ The assistant alone can do the work in 12 days.