Question

A can do a piece of work in 10 days B in 12 days and C in 15 days all begin together but A leaves the work after 2 days and B leaves 3 days before the work is finished how long did the work last

Answer 1

Actually the work will be finished in 15 days because it is not stated that C left. All of them began together. So C must continue though A and B left.

The work is finished in time by C alone.