A box of goldfish food can feed 3 fish for 4 weeks. How long will the box last if there are 7 goldfi

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A box of goldfish food can feed 3 fish for 4 weeks. How long will the box last if there are 7 goldfish?

4 weeks = 7 * 4 = 28 days
One box = 3 fish * 28 days = 84 days

84 days / 7 goldfish = 12 days