50 people can complete a piece of work in 40 days. Ir how many days can 100 people with twice the efficienc; complete the same piece of work ?

 50 people can complete a piece of work in 40 days. Ir how many days can 100 people with twice the efficienc; complete the same piece of work ?

A). 7 days

B). 10 days

C). 16 days

D). 18 days

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