A hostel has enough food to last 63 soldiers for 27 days. After 7 days, 27 more soldiers join them. For how many more days will the remaining food last?

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A 12 days
B 13 days
C 14 days
D 15 days

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Answer: C. 14 days

Total food = 63 x 27 = 1701 soldier-days.
Food used in 7 days = 63 x 7 = 441, so 1260 soldier-days are left.
New number of soldiers = 63 + 27 = 90.
Days the food will last = 1260 / 90 = 14 days.

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A hostel has enough food to last 63 soldiers for 27 days. After 7 days, 27 more soldiers join them. For how many more days will the remaining food last?

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