18 men can eat 20 kg of rice in 3 days. How long will 6 men take to eat 40 kg of rice?
Correct answer: B. 18
- A. 20
- B. 18
- C. 32
- D. 20
Explanation
The rice consumption rate is 20 kg ÷ (18 men × 3 days) = 20 kg ÷ 54 man-days. For 6 men to eat 40 kg, the required time is 40 kg × 54 man-days ÷ (20 kg × 6 men) = 18 days. The likely mistake is choosing 20 days by changing the quantity of rice without correctly applying the inverse relationship with the number of men.
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