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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

2 Answers

Yash Baheti IIT Roorkee
askIITians Faculty 97 Points
7 years ago
Hi,

Let talk about men days.
We are spending N man days per day and it will take 50 days to complete.
But now we have only N-80 man days of work per day so :
50N = (N-80)X
X= 280 days.

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Ashwin
41 Points
7 years ago
can you please explain a bit more 

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