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### (a) Problem: Henry bought 8 pounds of flour for $4.
**Question:** How many dollars did he pay per pound of flour?

**Solution:**
We need to find the price per pound of flour. To do this, we divide the total cost by the total weight in pounds.

\[
\text{Price per pound} = \frac{\text{Total cost}}{\text{Total pounds}} = \frac{4}{8} = 0.50
\]

Thus, Henry paid **$0.50 per pound** of flour.

### (b) Problem: At Hoffman's Bike Rentals, it costs $16 to rent a bike for 3 hours.
**Question:** How many dollars does it cost per hour of bike use?

**Solution:**
To find the cost per hour, we divide the total cost by the total hours.

\[
\text{Cost per hour} = \frac{\text{Total cost}}{\text{Total hours}} = \frac{16}{3} \approx 5.33
\]

Thus, it costs **$5.33 per hour** to rent the bike.

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Do you want more details on these solutions or have any questions?

Here are 5 related questions to extend your understanding:
1. What would Henry pay for 10 pounds of flour if the price per pound remains the same?
2. If Hoffman’s Bike Rentals increases the rate to $18 for 3 hours, what would be the new hourly cost?
3. How much would it cost to rent the bike for 5 hours at the current rate?
4. If Henry bought 12 pounds of flour for $6, would the price per pound be higher or lower than his previous purchase?
5. What is the total cost to rent two bikes for 3 hours each at the current rate?

**Tip:** When dividing to find a "per unit" rate, always divide the total by the number of units!

Henry bought 8 pounds of flour for $4. How many dollars did he pay per pound of flour? At Hoffman's Bike Rentals, it costs $16 to rent a bike for 3 hours. How many dollars does it cost per hour of bike use?

Learn how to calculate unit rates with two examples: the price of flour per pound and the cost per hour of a bike rental. Understand the importance of dividing total amounts by units to find individual rates. This problem is suitable for students in Grades 5-7.

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