A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?

 A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?

A). 21 ½ days

B). 22 ½ days

C). 23 ½ days

D). 12 ½ days

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