Question

Rajeev and Anuj can do a piece of work in 15 days and 18 days respectively. They work together for 5 days and then Rajeev leaves. In how many days would Anuj alone finish the work?

Answer 1

workdone by both rajeev and anuj is 1/15+1/18.. that is 11/90
workdone by both for 5 days is 5 (11/90)
tht is...11/18
work left is 7/18
7/18 is equal to 1/18 (time taken by anuj alone)
time taken by anuj is 7 days