Multiple choice general knowledge math & puzzles

18 men can finish a task in 4 days working 8 hours a day. In how many days 12 women will finish three times the same work, working 16 hours a day. Efficiency of woman is half that of a man.

  1. 9

  2. 18

  3. 27

  4. 36

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total work = 18 × 4 × 8 = 576 man-hours. For 3× work = 1728 man-hours. Women efficiency = 0.5, so 12 women = 6 man-equivalent. Required days = 1728/(6 × 16) = 1728/96 = 18 days. Key insight: convert everything to equivalent man-hours and account for efficiency difference.