Question

11. A and B can do a piece of work in 10 days. B and C in 15 days and C and A in 20 days. They all work at it for 6
days, and then A leaves, and B and C go on together for 4 days more. If B then leaves, how long will C take to
complete the work?
a) 20 days
b) 25 days c) 10 days d) 15 days e) None of these​

Answer 1

Answer:

a) 20 days may be not sure