# The ratio of Sue's age to Betty's age is 4:1. Twenty years from now, Sue will be twice as old as Betty will be then. How do you find their present age?

##### 2 Answers

Betty: 10

Sue: 40

#### Explanation:

Let

Let

Sue is

#### Explanation:

Let Sue's current age be

and Betty's current age be

The ratio of Sue's age to Betty's age is

Twenty years from now Sue will be twice as old as Betty.

Substituting

Substituting