A is twice as good a workman as B and together they finish a piece of work in 18 days. In how many days will A alone finish the work?
A. 31 days
B. 25 days
C. 27 days
D. 29 days
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Answer : C.
If A takes x days to do a work then B takes 2x days to do the same work.
--> 1/x+1/2x = 1/18
--> 3/2x = 1/18
--> x = 27 days.
Hence, A alone can finish the work in 27 days.
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