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Tricky Substitution Equation

Trick brain teasers appear difficult at first, but they have a trick that makes them really easy.

 

Puzzle ID:#50023
Fun:*** (2.43)
Difficulty:*** (2.78)
Category:Trick
Submitted By:eighsseAus******!

 

 

 



Karl and his friend Larry are always pulling trick brain teasers on each other. Larry has been getting the best of Karl all too often lately, so Karl really wants to get him back. He comes up with a good one, and writes the following on a piece of paper:
" YXZ
- YXY
= Y"
He shows it to Larry, and says, "Each different letter in this equation stands for a different digit. All instances of a given letter stand for the same digit. There are multiple true solutions, but what is the greatest digit that Y can stand for in a true solution?" Larry scans the equation over and over. He can't come up with any way that the answer could not be 4. "The answer must be four," he says, with confidence. Karl smiles and replies, "Sorry, you're incorrect."

What is the correct answer?





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Comments

charlottes-oddAen*
Dec 17, 2013

Another good one eighsse!
eighsseAus*
Dec 17, 2013

Thanks charlotte
koin_era345tus*
Dec 20, 2013

I don't know if this should be in trick, but I like it nonetheless.
eighsseAus*
Dec 20, 2013

It's in Trick because at first sight, the X's will likely be considered letters, which must stand for digits. But they really are multiplication signs, not letters. The only other category I might consider it to be is Situation, as it's somewhat unfair to the solver, considering that the body of the teaser is typed with an actual letter "X" character. So it's written with a third-person perspective since an "X" and a multiplication sign, in writing, are generally interchangeable. This might make it more fit for Situation, but I still feel it is more of a Trick.
dalfamnestAnz*
Jul 04, 2014

As a trick, I think it's great - top marks!! Thanks for something new and different.
eighsseAus*
Jul 04, 2014

Thanks dalfamnest, glad you enjoyed it
Zag24Aus*
Jul 21, 2014

Nicely done. Of course, I can beat your solution with my own. No one said that the digits were DECIMAL digits. (Back in the old days, I used to have to add and subtract hexidecimal values all the time. But there's no reason these digits aren't in base 10000000.)
eighsseAus*
Jul 21, 2014

Hah! This is true. Very nice, zag.



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