That's the joke. The number of terms doesn't change, and the last two have the same number of parens. The statements relate quantities of those things as though

That's the joke. The number of terms doesn't change, and the last two have the same number of parens. The statements relate quantities of those things as though they're a problem, when in reality the "just right one" only changes the order slightly. Hence the joke. It's one of those jokes that earns a loud sigh from me, rather than a chuckle.