In a fort there was sufficient food for 200 soldiers for 31 days. After 27 days 120 soldiers left the fort. For how many extra days will the rest of the food last for remaining soldiers ?
A
6 days
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B
8 days
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C
10 days
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D
12 days
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Solution
The correct option is A10 days Give, Total Soldiers = 200 Food for them = 31 days So, Quantity of food = 200 *31 = 6200 man-days Till 27 days, quantity consumed = 27 *200 = 5400 man-days Rest quantity = 6200 - 5400 = 800 man-days Remaining soldiers = 200 - 120 = 80 Let remaining food will sufficient for x days Now, 5400 + 80 x = 6200 80 x = 800 x = 10 days