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