A work which could be finished in 9 days was finished 3 days earlier after 10 more men joined. The number of men employed was?
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No of men employed = N
No of days to finish the work = 9 days
No of men after increase = (N + 10)
No of days to finish the work = 6 days
Equating mandays
9N = (N+10)*6
9N — 6N = 60
3N = 60
N = 20
No of men employed = 20