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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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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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Oct 25, 2020
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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?
Mathematics
middle-school
Dragan Radivojevic
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Dragan Radivojevic
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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.
Jaex
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Nov 1, 2020
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Jaex
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