Question

A can do a piece of work in 12 days and B can do the same work in 15 days and A,B and C together can finish the work in 5 days.In how many days C alone complete the work? please help....

Answer 1

Answer:

A s one day work = 1/12

B s one day work = 1/15

A +B + C s one day works = 1/5

1/12 + 1/15 + C = 1/5

C = 1/20

C will take 1 / (1/20) = 20 days