### Home > AC > Chapter 9 > Lesson 9.1.1 > Problem 9-7

9-7.

Solve the problem below by writing and solving an equation. A Guess and Check table may help you write the equation. Be sure to define your variable.

There are a total of

Let the number of countries in North America.

The total number of countries in all three continents is

So, there are

Remember to find the number of countries in Europe and Africa.