Question : There are 300 men in a group. They have food for 30 days. After 10 days, 100 more men join the group. The remaining food will last for how many days?
Option 1: 20
Option 2: 10
Option 3: 15
Option 4: 12
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Correct Answer: 15
Solution : There are 300 men in a group. They have food for 30 days. After 10 days, 100 more men join the group. Total number of men = (300 + 100) = 400 Remaining number of days = (30 – 10) = 20 So, 300 men had food for 20 days ⇒ 1 man had food for (20 × 300) days ⇒ 400 men have food for ($\frac{20× 300}{400}$) = 15 days Hence, the correct answer is 15.
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