Question

A is thrice as 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?

A 2 : 6 : 3
B 2 : 6 : 3
C 1 : 2 : 3
D 3 : 1 : 2
E 1 : 3 : 2
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