20. Casey bought a 100-pound bag of dog food. He gave his dogs the same amount of dog food each week. The dog food lasted 8 weeks. How much dog food did Casey give his dogs each week? Give the answer as a fraction or mixed number.

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To determine how much dog food Casey gave his dogs each week, you can divide the total amount of dog food by the number of weeks it lasted.

**Calculation:**

$$
\text{Weekly Dog Food} = \frac{\text{Total Dog Food}}{\text{Number of Weeks}} = \frac{100 \text{ pounds}}{8 \text{ weeks}}
$$

$$
\text{Weekly Dog Food} = 12.5 \text{ pounds}
$$

To express this as a mixed number:

$$
12.5 \text{ pounds} = 12 \frac{1}{2} \text{ pounds}
$$

**Answer:**  
Casey gave his dogs **$$12 \frac{1}{2}$$ pounds** of dog food each week.
Casey gave his dogs $$12 \frac{1}{2}$$ pounds of dog food each week.

20. Casey bought a 100-pound bag of dog food. He gave his dogs the same amount of dog food each week. The dog food lasted 8 weeks. How much dog food did Casey give his dogs each week? Give the answer as a fraction or mixed number.

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