Most people have a favorite and least favorite subject in school, and math often falls into one of those categories.
That’s why this classic math problem remains so interesting despite being around for many years—it’s still as challenging today as when it first appeared.
The problem asks: how much money does a man make if he buys a horse for \$60, sells it for \$70, buys it back for \$80, and sells it again for \$90?
Many struggle with this question because they overthink it, but the key is to keep it simple and consider each transaction separately.
The first sale yields a \$10 profit (70 mi