SOLUTION: My sister is half my age. Next year she will be three times as old as I was thirteen years ago. How old am I now?

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Question 220122: My sister is half my age.
Next year she will be three times as old as I was thirteen years ago.
How old am I now?
Answer by chibisan(131) About Me  (Show Source):
You can put this solution on YOUR website!
Your age = 2x , sister = x
1+x = 3(2x-13)
1+x = 6x - 39
40 = 5x
x = 8
2x = 16 (your age)