Question

A can do a work in 20 days. B can do it in 30 days. if they work together how many days required to complete the work

Answer 1

Answer:

A can do a work in 20 days

so Work done by A in 1 day=1/20

B can do a work in 30 days

so Work done by B in 1 day=1/30

Work done by (A+B) in 1 day = (1/20 + 1/30)=1/12

No. of days required to complete the work= 1/(1/12)=12 days.