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18 September, 14:10

Frank is eight years older than her sister. In three years he will be twice as old as she is. How old are they now?

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  1. 18 September, 15:03
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    Frank is 13 and his sister is 5.

    Explanation:

    Frank's age: y=x+8

    After 3 years, their ages will be y=x+11 and his sisters age, y=x+3.

    In 3 years he will be twice as old.

    Equation:

    x+11=2• (x+3) - > x=5

    Frank is now 5+8=13.
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