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In this video, we solve age-related word problems focusing on Sally and John's ages. Sally is three times older than John. In eight years, Sally will be twice as old as John. We denote Sally's age as s and John's age as j. In the present, Sally's age is s and John's age is j. In the future, Sally's age will be s+8 and John's age will be j+8. The equations are s=3j for the present and s+8=2(j+8) for the future. We have two variables to solve for John's age.
