A deceptively simple brainteaser is making the rounds again, built on just a cow and four tidy numbers: 800, 1,000, 1,100, and 1,300. There are no hidden fees, no interest rates, and no trick wording—just two straightforward transactions. Yet many people still get it wrong.
The confusion doesn’t come from the math itself, but from how people approach it. Faced with multiple steps, the brain often tries to compress everything into a single calculation or assumes the second deal somehow cancels out the first. That’s when confident—but incorrect—answers like $0 or $200 start popping up.
The solution becomes clear when the problem is broken down. In the first transaction, you buy for $800 and sell for $1,000, earning a $200 profit. In the second, you buy for $1,100 and sell for $1,300, adding another $200. Combined, that’s a total gain of $400.
Looking at the bigger picture leads to the same conclusion: $1,900 spent and $2,300 earned results in a $400 profit.
The real takeaway isn’t the answer itself, but how easily a straightforward sequence can trip people up. The puzzle highlights a familiar pattern—when rushed, even simple problems can feel confusing. Slow, step-by-step thinking, however, quickly cuts through the noise.
