Question

A and B can do a piece of work in 12 days and A alone can do it in 20 days. In how many days can B alone do it ?​

Answer 1

Answer:

A and B can do a piece of work in 12 days

A alone can do it in 20 days

B alone do it in (12×20/20-12) days=(12×20/8) days=30 days

Answer 2

Step-by-step explanation:

20 days

A’s 1 day’s work = \frac{1}{12}-\frac{1}{30} = \frac{5-2}{60} = \frac{3}{60} = \frac{1}{20}

So, A alone will complete the work in 20 days.