Question

Alekh and alia can together do a piece of work in 5 days which alia and aman together can do in 15 days. After alekh has been working at it for 4 days and alia for 5 days, aman then takes up and completes the work alone in 4 days. In how many days can alia do the work alone?
Any short trick for this question

Answer 1

Answer:

I don't no correct answer but I think 11days.