Question

A can can do a piece of work in 4days and B can do a piece of work in 12days.In how many days can both do it together?​

Answer 1

Answer:

3 days

A’s 1 day’s work = \frac{1}{4}

B’s 1 day’s work = \frac{1}{12}

(A + B)’s 1 day’s work = \frac{1}{4} + \frac{1}{12}

= \frac{3+1}{12} = \frac{4}{12} = \frac{1}{3}

∴ Required Time = 3 days

Answer 2

3 days will be needed.