SOLUTION: Frank is eight years older than his sister. In three years he will be twice as old as she is. How old are they now?
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Question 1147795: Frank is eight years older than his sister. In three years he will be twice as old as she is. How old are they now?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
(1) Algebra....
let x be his sister's age
then x+8 is his age
His sister's age 3 years from now will be x+3; his age 3 years from now will be x+11.
3 years from now, his age will be twice his sister's age:
Solve using basic algebra (I leave that to you).
(2) Logical reasoning....
Since the difference in their ages is 8 years, Frank will be twice as old when he is 16 and his sister is 8. Since that will be 3 years from now, their current ages are 13 and 5.
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