Question

A and B together complete the piece of work in 12 days while B alone can finish it in 30 days. In how many days can A alone finish the work ?​

Answer 1

Work in one day by A

$\frac{1}{12}-\frac{1}{30} = \frac{5-2}{60} = \frac{3}{60} = \frac{1}{20}$

So answer is that a will finish alone in 20 days