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A and B can do a work in 20 days, B and ...

A and B can do a work in 20 days, B and C can do it in 30 days and C and A can complete it in 15 days. If A and B starts the work and on every second day C help them, then in how many days, the work will be completed?

A

16

B

18

C

26

D

36

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The correct Answer is:
A
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