SOLUTION: When my father was 30, I was 7. Now he is twice as old as I am. How old am I ?

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Question 799885: When my father was 30, I was 7. Now he is twice as old as I am. How old am I ?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
"Now", same amount of years passed, for both of you. Call it y.
He is 30%2By and you are 7%2By.
He is two times older than you, so %2830%2By%29%2F%287%2By%29=2

30%2By=2%28y%2B7%29
30%2By=2y%2B14
30-14=2y-y
16=y
We now know that 16 years have passed.
You are 7%2B16=highlight%2823%29