2017 · Q24
If 15 men take 21 days of 8 hours each to do a piece of work, then what is the number of days of 6 hours each that 21 women would take, if 3 women would do as much work as 2 men ?
Elementary MathematicsTime and Work
- A18
- B20
- C25
- D30
Explanation
Total work = 15 × 21 × 8 = 2520 man-hours. Since 3 women = 2 men, 21 women = 14 men. Days needed = 2520/(14 × 6) = 30: option D.