Question

A can do a piece of work in 20 days while B can do it in 15 days.With the help of C they completed the work in 5 days.In what time would C alone do it.​

Answer 1

Step-by-step explanation:

A does in one day 1/20 part of the work.

B in one day does 1/15 part of the work.

A+ B together do in one day 1/20+1/15 part of the work= 7/60 part of the work.

A+B+ C do in one day 1/5 part of the work.

C alone does in one day 1/5–7/60 part of the work=[ 5/60 ]part of the work

Therefore C alone can do the work in 60/5 days= 12 days answer