A is thrice efficient as B and C is twice as efficient as B. what is the ratio of number of days taken by A,B and C , when they work individually?

2 : 6 : 3
2 : 3 : 6
1 : 2 : 3
3 : 1 : 2

Correct Answer: 2 : 6 : 3

Explanation:

A : B : C
Ratio of efficiency 3 : 1 : 2
Ratio of number of days { 1/3 : 1/1 : 1/2 }
or 2 : 6 : 3
Hence, (a) is correct [ Time = 1/ Efficiency ]

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