35 women can do a work in 15 days. How many women would be required to do the same work in 25 days?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 21
The amount of work is fixed, so the number of workers × the number of days stays the same: if the work may take more days, fewer women are needed.
Total work: \(35\times15=525\) woman-days (one woman would need 525 days)
Women needed to finish it in 25 days: \(525\div25=21\)