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Q.

A and B working separately can do a piece of work in 10 and 15 days respectively . If they work on alternate days beginning with A, in how many days will the work be completed 

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a

13 days

b

15 days

c

12 days

d

20 days

answer is A.

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Detailed Solution

Work done by A in 1 day  =110 

Work done by B in 1 day =115

Work done by A and B in 2 days  =110+115

=3+230=530=16

∴16work is done in 2 days

1 Work will be done in  2×6=12 days.

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