In a hostel mess there is enough food provisions for 1200 boarders for a month. After 15 days half of them leave due to vacations. How long will the food provisions now last?
Correct answer: B. 30 days
- A. 20 days
- B. 30 days
- C. 35 days
- D. 50 days
Explanation
The original provisions equal 1,200 boarders × 30 days = 36,000 boarder-days. The first 15 days use 1,200 × 15 = 18,000 boarder-days, leaving 18,000 boarder-days; after half leave, 600 boarders remain, so the food lasts 18,000 ÷ 600 = 30 more days. The likely mistake is choosing 35 days by adding or subtracting days without converting the provisions into boarder-days.
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