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N workmen could have build a dam in 50 days. 80 of them did not turn up. find N, if the work took 70 days for completion. (A) 340 (B) 320 (C) 350 (D)280

  1. N workmen could have build a dam in 50 days. 80 of them did not turn up. find N, if the work took 70 days for completion.
(A) 340     (B) 320      (C) 350       (D)280

Grade:10

1 Answers

Harsh Patodia IIT Roorkee
askIITians Faculty 907 Points
6 years ago
Dear Student,

N men 50 days
Toatl work 50*N
N-80 men 70 days
Total work (N-80)*70

But in both cases work is finished
Hence
50*N= (N-80)*70
On solving N=280\

D is the correct choice

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