Question : Raju, Shobh, and Mohan can do a work in 15 days, 20 days and 25 days respectively. In how many days, will the work be finished, if they do it on alternate days, starting from Raju?
Option 1:
Option 2:
Option 3:
Option 4:
Correct Answer:
Solution :
Time taken by Raju to do the work = 15 days
Time taken by Shobh to do the work = 20 days
Time taken by Mohan to do the work = 25 days
Work done by Raju in a day =
Work done by Shobh in a day =
Work done by Mohan in a day =
Work done by Raju, Shobh and Mohan in 3 days if they work alternatively
= (
Work done by Raju, Shobh and Mohan in 18 days if they work alternatively
=
Work left =
Time taken by Raju to complete the remaining work =
So, the total time taken
Hence, the correct answer is
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