### Home > CAAC > Chapter 4 > Lesson 4.2.4 > Problem 4-105

4-105.

Define a variable.

*r* = Regina's favorite number

Use the first sentence to write an equation.

Look at the important parts of the problem above.

Solve for *r*.

4-105.

Define a variable.

*r* = Regina's favorite number

Use the first sentence to write an equation.

Look at the important parts of the problem above.

Solve for *r*.