Two friends A and B can complete a piece of work in 20 days and 30 days respectively. They started working on alternate days. Once exactly half of the work was completed, they started working together. In this manner, how many days did they take to complete the work?

Two friends A and B can complete a piece of work in 20 days and 30 day

1.	Two friends A and B can complete a piece of work in 20 days and 30 days respectively. They started working on alternate days. Once exactly half of the work was completed, they started working together. In this manner, how many days did they take to complete the work?
A.	12 days
B.	18 days
C.	20 days
D.	16 days
E.	None of these
Answer» C. 20 days

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Two friends A and B can complete a piece of work in 20 days and 30 days respectively. They started working on alternate days. Once exactly half of the work was completed, they started working together. In this manner, how many days did they take to complete the work?

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