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Question

Pranab is thrice as efficient as Ghulam, and Ghulam is twice as efficient as Krishna. If the trio work together, how long will they take to complete a job which Ghulam completes in 25 days.


Solution

The correct option is A

Let total work be 100 units.

Ghulam’s one day work = = 4 units.

Pranab’s one day work = 12 units.

Krishna’s one day work = 2 units.

Combined work of the trio = 4 + 12 + 2 = 18 units.

Hence, They will take = days. Option(a).  

2nd method:- In place of unit, we can take in percentage form also.In one day, G=4% , P=12% , K=2%. 

 Total in one day= 18% , Then 100% in 100/18 days i.e 50/9 days. Option(a).

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