Question

A and B together can do a job in 12 days, while B alone can finish it in 30 days.
In how many days can A alone finish the work?

Answer 1

Answer:

A and B together can do a piece of work in 12 days, while B alone can finish it in 30 days. A alone can finish the work in :

[A]15 days

[B]18 days

[C]20 days

[D]25 days

20 days

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

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

Hence option [C] is correct answer.