A is 30% more efficient than B, and can alone do a work in 23 days. The number of days, in which A and B, working together can finish the job is

A is 30% more efficient than B, and can alone do a work in 23 days. Th

1.	A is 30% more efficient than B, and can alone do a work in 23 days. The number of days, in which A and B, working together can finish the job is
A.	11 days
B.	13 days
C.	20 days
D.	21 days
Answer» C. 20 days

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A is 30% more efficient than B, and can alone do a work in 23 days. The number of days, in which A and B, working together can finish the job is

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