# Lesson 11

Comparing Groups

Let’s compare two groups.

### Problem 1

Compare the weights of the backpacks for the students in these three classes.

### Problem 2

A bookstore has marked down the price for all the books in a certain series by 15%.

- How much is the discount on a book that normally costs $18.00?
- After the discount, how much would the book cost?

### Problem 3

Match each expression in the first list with an equivalent expression from the second list.

### Problem 4

Angles \(C\) and \(D\) are complementary. The ratio of the measure of Angle \(C\) to the measure of Angle \(D\) is \(2:3\). Find the measure of each angle. Explain or show your reasoning.