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Twenty men can lay a road off 50 km long in 10 days. In how many days can 15 men lay a road of 75 km long?

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Twenty men can lay a road off 50 km long in 10 days. In how many days can 15 men lay a road of 75 km long?
A. 10 days
B. 20 days
C. 30 days
D. 40 days
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Correct Answer - B
(i) Use direct variation concept.
(ii) `(M_(1)d_(1))/(L_(1))=(M_(2)d_(2))/(L_(2))`, where `L_(1) and L_(2)` are lengths of the road.
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