As you indicated it is valid through the 4th step. Dividing by zero (X-Y) is not allowed. This confuses a lot of people so your initial premise in this thread may not be correct.
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Here is a valid mathematical riddle:
You are a wildlife photographer at a small camp in the wilderness. You wake up in the morning and start looking for wildlife to take pictures of. You head 8 miles due south but don't see any animals to take a picture of. You continue by heading 8 miles due east and still don't see any animals to take a picture of. You then head 8 miles due north and see a bear in your camp so you take a picture.
The mathematical question is:Â What color is the bear?
Being well schooled in the old math, the answer of course is Kodachrome. If it is an Alaskan bear it would have been a Kodiakchrome color.
Cute answer even though mathematically incorrect
Well I tried. Anyway, seeing a bear ( or your camp)  from eight miles away would be tough, unless…. Let’s just say it’s Polar Bear white. How cute is that!?
As you indicated it is valid through the 4th step. Dividing by zero (X-Y) is not allowed. This confuses a lot of people so your initial premise in this thread may not be correct.
Â
Here is a valid mathematical riddle:
You are a wildlife photographer at a small camp in the wilderness. You wake up in the morning and start looking for wildlife to take pictures of. You head 8 miles due south but don't see any animals to take a picture of. You continue by heading 8 miles due east and still don't see any animals to take a picture of. You then head 8 miles due north and see a bear in your camp so you take a picture.
The mathematical question is:Â What color is the bear?
Being well schooled in the old math, the answer of course is Kodachrome. If it is an Alaskan bear it would have been a Kodiakchrome color.
Cute answer even though mathematically incorrect