C is 40% less efficient than A. A and B together can finish a piece of – McqOptions

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1.	C is 40% less efficient than A. A and B together can finish a piece of work in 10 days. B and C together can do it in 15 days. In how many days can A alone finish the same piece of work?
A.	15 days
B.	9 days
C.	12 days
D.	18 days
E.	None of these
Answer» D. 18 days

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C is 40% less efficient than A. A and B together can finish a piece of work in 10 days. B and C together can do it in 15 days. In how many days can A alone finish the same piece of work?