SOLUTION: Jack 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 818940: Jack 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 TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
j = s + 8
j + 3 = 2(s + 3)
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j + 3 = 2(s + 3)
s + 8 + 3 = 2s + 6
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s = 5
j = 13
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