A group of 40 boys went for camping. They carry food for 15 days. If 10 more boys join them then for how many days the food last?

A group of 40 boys went for camping. They carry food for 15 days. If 10 more boys join them then for how many days the food last?
1). 13 days
2). 8 days
3). 10 days
4). 12 days

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