# Lesson 9

Solving Rate Problems

Let's use unit rates like a pro.

This package of sliced cheese costs $2.97. How much would a package with 18 slices cost at the same price per slice? Explain or show your reasoning. ### Problem 2 A copy machine can print 480 copies every 4 minutes. For each question, explain or show your reasoning. 1. How many copies can it print in 10 minutes? 2. A teacher printed 720 copies. How long did it take to print? ### Problem 3 Order these objects from heaviest to lightest. (Note: 1 pound = 16 ounces, 1 kilogram $$\approx$$ 2.2 pounds, and 1 ton = 2,000 pounds) item weight school bus 9 tons horse 1,100 pounds elephant 5,500 kilograms grand piano 15,840 ounces ### Problem 4 Andre sometimes mows lawns on the weekend to make extra money. Two weeks ago, he mowed a neighbor’s lawn for $$\frac{1}{2}$$ hour and earned$10. Last week, he mowed his uncle’s lawn for $$\frac{3}{2}$$ hours and earned $30. This week, he mowed the lawn of a community center for 2 hours and earned$30.

Which jobs paid better than others? Explain your reasoning.

(From Unit 3, Lesson 5.)

### Problem 5

1. $$\frac12 \boldcdot 17$$
2. $$\frac34 \boldcdot 200$$
3. $$(0.2) \boldcdot 40$$
4. $$(0.25) \boldcdot 60$$
(From Unit 3, Lesson 1.)

### Problem 6

Here is a polygon.