Question: anil can do a work in 15 days?
Answer: If Anil can do the work in 12 days, then he has to complete 1/12 th fraction of work each day. Similarly, if Basheer can do the work in 15 days, then he has to complete 1/15 th fraction of work each day and also if Chandran can do the work in 20 days, then he has to do 1/20 th fraction of work each day.