Question

A can do a piece of work in 15 days and B can do the same work in 20 days they work together for 6 days then B fill it so remaining work was completed by A.in how many days a complete the work?​

Answer 1

Answer:

Together they can complete 1/25+ 1/20 work in one day. Hence in 5 days they can complete 5/25 + 5/20 work. ie = 9/20 work. Hence B can complete the remaining 11/20 work in 11/20 / 1/20=11 days.