SOLUTION: when Karl is 17, he will be 5 years older than Laura was when she was twice as old as Karl is now. How old is Karl now?

Question 827370: when Karl is 17, he will be 5 years older than Laura was when she was twice as old as Karl is now.
How old is Karl now?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
= Karl's age now.
= Laura's age now (just in case I need that variable).
Apparently, at some time in the past Laura's age was .
Apparently, Karl has not turned 17 yet, but when Karl turns 17,
he will be 5 years older than .
So is our equation.

Solving:

We do not know how old Laura is.
We know she was 12 at some time in the past.
She maybe 13, or 100, or any other age, but Laura's age does not matter to the problem.
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