Question

A b and c working together can finish a piece of work in 8 days.a alone can do it in 20 days and b alone can do it in 24 days. in how many days c alone can do this same work.

Answer 1

a+b+c=1/8
a=1/20
b=1/24
c=1/8-1/20-1/24=15-6-5/120=4/120=1/30
c alone can do the same work in 30 days.