At any army camp the provisions were stored for 40 days but ten days after the no. of soldiers become double. Now the food lasts for x days. What is x?
Correct answer: D. 15
- A. 30
- B. 40
- C. 50
- D. 15
Explanation
The original supply is 40 soldier-days. During the first 10 days, 10 soldier-days are used, leaving 30 soldier-days; when the number of soldiers doubles, the remaining food lasts 30 soldier-days ÷ 2 soldiers per original soldier = 15 days. The likely mistake is choosing 30 days by forgetting that doubling the soldiers halves the remaining duration.
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