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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19-11-2019
Mathematics

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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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nikkyrosa nikkyrosa · Answer 1 · 2019-11-19T07:48:16+01:00

nikkyrosa nikkyrosa

19-11-2019

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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