Question

P can finish a work in 18 days. q can finish the same work in 15 days. q worked for 10 days and left the job. how many days does p alone need to finish the remaining work?

Answer 1

P's 1-day work = 1/18 and Q's 1-day work = 1/15 then Q's 10-day work = 10/15.

The remaining Q's work = 1 - 2/3 = 1/3.

P alone need to finish the remaining work in (1/3)/(1/18) = 6.