Multiple choice

A certain number of men can do a work in 45 days. If there were 8 men less it could be finished in 5 more days. How many men are there?

  1. 75

  2. 70

  3. 78

  4. 72

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Let M be the number of men. Work = M × 45 man-days. With (M-8) men, time = 50 days. So (M-8) × 50 = M × 45, giving 50M - 400 = 45M, so 5M = 400, M = 80. Since 80 is not among A-D, E is correct.

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