A can do a work in 21 days. B is 40% more efficient than A. The number of days required for B to finish the same work alone is

A can do a work in 21 days. B is 40% more efficient than A. The number

1.	A can do a work in 21 days. B is 40% more efficient than A. The number of days required for B to finish the same work alone is
A.	10 days
B.	12 days
C.	15 days
D.	18 days
Answer» D. 18 days

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A can do a work in 21 days. B is 40% more efficient than A. The number of days required for B to finish the same work alone is

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