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A takes twice as much time as B and thrice as much as C to complete a piece of work. They together complete the work in 1 day. In what time, will A alone complete the work.

A9 days

B5 days

C6 days

D4 days

Answer:

C. 6 days

Read Explanation:

time taken by A : time taken by B = 2 : 1 time taken by A : time taken by C = 3 : 1 Ratio of time taken to do the work A : B : C = 6 : 3 : 2 efficiency of A : B : C = 6 : 12 : 18 = 1 : 2 : 3 total work = (1 +2+ 3)1 = 6 time taken by A alone to complete the work = 6/1 = 6 days


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