alleryTen men working 8 hours a day build a wall in 18 days. Twelve men at 6 hours a day need
A18 days
B24 days
C15 days
D20 days
Answer & Solution
Correct answer: D. 20 days
The wall is 10 x 8 x 18 = 1440 man-hours, and 12 x 6 = 72 per day gives 20 days.
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