A, B and C can do a piece of work in 20, 40 and 80 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

A, B and C can do a piece of work in 20, 40 and 80 days respectively.

1.	A, B and C can do a piece of work in 20, 40 and 80 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
A.	7 days
B.	15 days
C.	18 days
D.	16 days
Answer» E.

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A, B and C can do a piece of work in 20, 40 and 80 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

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