Question

A and b can do a piece of work in 20 days if a alone can finish the work in 30 days how many days bi alone can finish it

Answer 1

Answer:

60 days

Step-by-step explanation:

A+B =20days =1work. So, in 1day = 1/20 work.

A =30days =1work. So, in 1day= 1/30 work.

Then, as, A+B (in 1day) = 1/20 work. Or, 1/30 + B= 1/20. Or, B= 1/20 - 1/30 = 1/60 work.

So, B 1/60 work = 1day, or, 1work = 60x1/1=60 days.