The ratio of the efficiencies of A, B and C, to do a certain work is 7 – McqOptions

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1.	The ratio of the efficiencies of A, B and C, to do a certain work is 7 ∶ 3 ∶ 5. Working together, they can complete the work in 21 days. A and C worked together for 15 days. The remaining work will be completed by B alone in∶
A.	60 days
B.	54 days
C.	45 days
D.	63 days
Answer» D. 63 days

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