Mathematics
NULL
Medium
Question
8 men dig a pit in 20 days. If a man works half as much again as a boy, in how many days can 4 men and 9 boys dig a similar pit?
A
12 days
B
16 days
✓ Official correct answer
C
18 days
D
20 days
Community credibility
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A
12 days
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B
16 days
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C
18 days
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D
20 days
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Explanation
Man = 1.5 × boy ⇒ 9 boys ≡ 6 men. Then 4 men + 9 boys ≡ 10 men. Work = 8 × 20 man-days ⇒ days = 160/10 = 16 days.