Multiple choice general knowledge math & puzzles

15 men take 21 days of 8 hrs. each to do a piece of work. How many days of 6 hrs. each would it take for 21 women if 3 women do as much work as 2 men?

  1. 20

  2. 15

  3. 30

  4. 25

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

3 women = 2 men, so 21 women = 14 men. Using M1D1H1 = M2D2H2: 15 * 21 * 8 = 14 * Days * 6. 2520 = 84 * Days. Days = 2520 / 84 = 30 days.