8 machines can do a piece of work in 10 days. How long will it take 16 machines to do the work?

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A. 7 days
B. 6 days
C. 5 days
D. 8 days

C. 5 days

1 machine will complete the piece of work in 8×10 days.
So,
16 machines will do in = (8*10)/16
16 machines will do in = 5 days

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