Question

anuj and bhanu can together finish a work in 30 days. they worked together for 20 days and then bhanu left. after another 20 days, anuj finished the remaining work, in how many days anuj alone can finish the job?

Answer 1

Anuj & Bhanu finish the work in 30days.
In 20 days they have finished 20/30= 2/3 of work
The work left was 1-2/3=1/3
Anuj finished the work 1/3 work in 20 days
 Anuj would finish the whole work in 1*20/(1/3)=60 days.
alone Anuj would  finished the work in 60days.