Question

A and B together can do a job in 4 days.If A can do job in 12 days if he works alone ,then how many days B alone take to complete the job?

Answer 1

A and B can do 1/4 part of job in one day

A can do the 1/12 part of same job in a day

let the days that B takes to complete the job be x

1/12+1/x=1/4

1/x=1/4-1/12

1/x=1/6

In 6 days B alone do the job