If 3 dogs eat a bag of food in 15 days. How long will 5 dogs take to finish a bag of food?

If 3 dogs eat a bag of food in 15 days. How long will 5 dogs take to finish a bag of food?
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1 dog would take 3 times as long to eat a bag of food, so that would be 45 days. 5 dogs would take 5 times less time  to eat a bag of food, which is 45/5=9 days.

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