A, B and C can do piece of work in 18,24...

A, B and C can do piece of work in 18,24 and 36 days respectively . They work alternately , first day C, second day B and third day A, fourth day C and so on. How many days will be needed to complete the work like this way?

A

18

B

20

C

24

D

30

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The correct Answer is:

C

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