2021 · Q69
If 20 persons can clean 20 floors in 20 days, then in how many days can 16 persons clean 16 floors?
Elementary MathematicsTime and Work
- A25 days
- B24 days
- C20 days
- D16 days
Explanation
One person cleans one floor in 20 days (20 persons × 20 days for 20 floors). With 16 persons and 16 floors, the time is 16·20/16 = 20 days. Hence option C.