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Among 4 persons A, B, C and D. A takes twice as much time as B to complete a piece of work. B takes twice as much time as C and C takes twice as much time as D to complete the same work. One group of three of the four men can complete the work in 11 days while another group of three can do so in 7 days. Which is the group that takes 11 days? a) A.B.C b) A,B,D c) B,C,D d) None of the above
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B

From the given information B is twice as efficient as A.

C is twice as efficient as B.

D is twice efficient as C.

If work done by A in a day is 'n' units, the work done in a day by B, C and D would be 2n, 4n and 8n units

respectively.

It can be seem that, A, B and C working together can do 7n units in a daywhile A, B and D working together

can do 11n units in a day.

Hence, the ratio of times taken to complete the work by the former and later groups is 11:7

A, B and D take 11 days.
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