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3 men and 7 women can do a job in 5 days...

3 men and 7 women can do a job in 5 days, while 4 men and 6 women can do it in 4 days. The number of days required for a group of 10 women working together, at the same rate as before, to finish the same job is :

A

30

B

36

C

40

D

20

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