There’s an Easier Method
Instead of thinking about cows at all, imagine you’re recording every transaction in a notebook.
A purchase gets a minus sign.
A sale gets a plus sign.
Then add everything:
− Purchase 1 + Sale 1 − Purchase 2 + Sale 2
That’s it.
If the final number is positive, you made a profit.
If it’s negative, you lost money.
This method works whether you’re trading a cow, car, bicycle, phone, painting, or anything else.
Why People Keep Getting Different Answers
Most wrong answers come from a few simple mistakes.
Some people compare only the first purchase with the final sale.
Others correctly calculate the first profit but forget that buying the cow again creates another expense.
Another common mistake is counting the same money twice.
The story makes the problem feel more complicated than the arithmetic really is.
Once every transaction is written as either money entering or leaving your pocket, the confusion usually disappears.
The Cow Isn’t Really the Puzzle
The underlying lesson is about cash flow.
Businesses track money coming in and going out.
Investors compare purchase and selling prices.
People reselling cars, collectibles, electronics, or other items must do the same thing.
The cow simply makes the problem memorable.
So What’s the Correct Answer?
For the viral version referenced in the puzzle, the stated answer is:
$400 profit.
However, that answer is correct only if the original transaction amounts actually produce a net gain of $400.
Using the example figures of $800 → $1,000 → $1,200 → $2,200, the answer would instead be:
$1,200 profit.
That’s why the safest approach is never to memorize the viral answer.
Calculate it yourself:
Add every sale. Add every purchase. Subtract total purchases from total sales.
The puzzle isn’t testing whether you can perform difficult mathematics.
It’s testing whether you can resist rushing, keep track of every transaction, and notice when the numbers don’t match the claimed answer.
And sometimes, spotting that inconsistency is the real puzzle.
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