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?

- 18
- 20
- 25
- 30

**Answer**

Total Work Done = Number of men or women × days × hours × efficiency

15 × 21 × 8 × 1/2 = 21 × days × 6 × 1/3

days = 30

**The correct option is D.**