Question

A can do a peice of work in 20days and b can do it in 30days.How long will A and B take working together​

Answer 1

A’s 1 day’s work = \frac{1}{20}

B’s 1 day’s work = \frac{1}{30}

∴ (A + B)’s 1 day’s work = \frac{1}{20} + \frac{1}{30} = \frac{3+2}{60} = \frac{1}{12}

So, the work will be completed in 12 days if they work together.

Hence option [B] is correct answer.

hope it will help you plzzzz Mark as braunliest