alleryIf 12 men can build a wall in 15 days, how long will 18 men take?
A10 days
B12
C20
D10 days (man-days: 12×15 = 180; with 18 men: 180/18 = 10)
Answer & Solution
Correct answer: D. 10 days (man-days: 12×15 = 180; with 18 men: 180/18 = 10)
Total work = 12 men × 15 days = 180 man-days.
**With 18 men:** time = 180/18 = 10 days.
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