Question

A can do a piece of work in 20 days while B can do it in the 15days. With the help of C, they finish the work in 5days. I’m what time would C alone do it

Answer 1

Answer:

A=1/20. B=1/15

A+B+C=1/5

1/20+1/15+C=1/5

C=1/5-1/15-1/20

C=1/12

C can do work in 12 days