A and B can do a piece of work in 30 days and 15 days, respectively, A – McqOptions

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1.	A and B can do a piece of work in 30 days and 15 days, respectively, A and B start the work together. In how many days will the entire work be completed?
A.	10
B.	12
C.	15
D.	9
Answer» B. 12

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