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Let's solve each part of the problem step by step.

### Part (a)
David bought 15 pounds of sugar for $6. To find out how many pounds of sugar he got per dollar, we divide the total pounds by the total cost:

\[
\text{Pounds per dollar} = \frac{15 \text{ pounds}}{6 \text{ dollars}} = 2.5 \text{ pounds per dollar}
\]

### Part (b)
A color printer prints 9 pages in 5 minutes. To find out how many minutes it takes per page, we divide the total time by the total number of pages:

\[
\text{Minutes per page} = \frac{5 \text{ minutes}}{9 \text{ pages}} \approx 0.56 \text{ minutes per page}
\]

Thus, the answers are:
- (a) 2.5 pounds per dollar
- (b) 0.56 minutes per page

Would you like further details or have any questions?

### Related Questions:
1. How would the answers change if David bought 20 pounds of sugar for $8?
2. What is the rate in dollars per pound if David bought 15 pounds of sugar for $6?
3. If a printer can print 12 pages in 4 minutes, how many minutes per page is that?
4. How many pages can a printer print in 10 minutes if it prints at the same rate as part (b)?
5. What other units could be used to measure the rate in part (a)?

### Tip:
When calculating rates, dividing a quantity by time or cost will give you a per-unit rate, which helps compare different scenarios efficiently.

David bought 15 pounds of sugar for $6. How many pounds of sugar did he get per dollar? A color printer prints 9 pages in 5 minutes. How many minutes does it take per page?

Learn how to calculate unit rates such as how many pounds of sugar per dollar and how many minutes per page for a printer. This problem involves basic division and proportion concepts, suitable for students in Grades 5-7.

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