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Ah, okay, I see what you did there....

It wasn't a bad riddle, barring your mistake--and I might have seen it if it had been a president who ISN'T on our currency. :)

No one's gotten MY riddle...

That would be Abraham Lincoln, but it still doesn't make perfect sense.... Because where does Andrew Jackson fit in?

D'oh! :doh:

1 = George Washington?
7 = Andrew Jackson?
18 = Ulysses S. Grant?

But that doesn't make sense....

I tried letters of the alphabet, as well as Roman numerals, and neither of those work....

Well, then, I have NO idea....

:unsure:

Assuming this is algebra, and you're having actual numbers stand in for letters....

7 must be four times 18, and 1 must be 25 times 7, right?

So say instead of 1, 18, and 7 you substitute A, R,...