Dhaval and Dhiraj together can do a piece of work in 12 days. Dhaval alone can do it in 20 days. In how many days can Dhiraj alone do it?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 30.
Let total work = LCM(12, 20) = 60 units
Dhaval and Dhiraj's 1 day work = 60/12 = 5 units
Dhaval's 1 day work = 60/20 = 3 units
Dhiraj's 1 day work = 5 – 3 = 2 units
Time required for Dhiraj alone = 60/2 = 30 days