Piyal and Belal together can complete a work in 3 days. They start together but after 2 days, Belal left the work. If the work is completed after two more days, Belal alone could do the work in how many days?

Question: Piyal and Belal together can complete a work in 3 days. They start together but after 2 days, Belal left the work. If the work is completed after two more days, Belal alone could do the work in how many days?

Solution:
(Piyal + Belal)'s one day's work = 1/3 part
(Piyal + Belal) works 2 days together = 2/3 part
Remaining work = 1- 2/3
= 1/3 part

1/3 part of work is completed by Piyal in two days
Hence, one day's work of Piyal = 1/6 part

Then, one day's work of Belal = 1/3 - 1/6 = 1/6
So, Belal alone can complete the whole work in 6 days.