X, Y and Z can do a piece of work in 30 days, 45 days and 90 days resp – McqOptions

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1.	X, Y and Z can do a piece of work in 30 days, 45 days and 90 days respectively. In how many days can the work be completed if X is assisted by Y and Z together, on every second day?
A.	10 days
B.	20 days
C.	15 days
D.	30 days
Answer» C. 15 days

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