By Oliver Green • February 28, 2026 • Share
Picture this: you spend $800 on a cow and make $1,000 when you sell it. It’s a neat little profit, isn’t it? But wait, there’s more to this intriguing math puzzle that’s been capturing the attention of many inquisitive minds online.
After some time has passed, you find yourself reinvesting $1,100 in the same cow. Perhaps it seemed like a promising deal once again. And indeed, when you sell it, you make $1,300. The numbers seem straightforward, but they beg the question: in all, how much money have you truly earned?
At first glance, the solution might appear simple. Yet, it’s the simplicity that hides the true complexity of this brain teaser. The transactions seem easy enough to follow, each sale bringing in a certain profit. However, combining the numbers gives a more intricate picture.
The initial purchase and sale give you a profit of $200. That’s clear. But then, the reinvestment and subsequent sale add another layer to the equation. Does the profit from the second transaction simply stack on top of the first?
Read more on the next page ⬇️⬇️⬇️
