Girls = Evil?

So my brother told me this joke today.

Given "girls = money * time".
If "time = money" (time is money), then "girls = money * money".
Since "money = √evil" (money is the root of all evil), "girls = √evil * √evil" or "girls = evil".

I'm sorry Nichole, but that's very convincing logic. I'm afraid I'll have to let you go. I can't go out with anyone who's more evil than I am. :P