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A work which could be finished in 11 days was finished 4 days earlier after 4 more men joined. The number of men employed was ?

Correct Answer: 7

Explanation:

As the work is same
M1D1 = M2D2


Here Let the number of men employed was M
=> 11M = 7(M+4)
=> 11M - 7M = 28
=> M = 7


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