"I lost 17 pounds!" announces my husband triumphantly as he bursts out of the bathroom.
"Seventeen pounds? Really? How on earth did you do that so fast?" I ask. I mean, it just isn't fair the way he decides to lose weight and it's gone.
"Well," he says virtuously, "I've been eating better, and I've been exercising. Yeah! I was..." and he tells me what he weighed to start with and what he weighs now.
"Um," I say, manipulating the numbers in my head, "that's not seventeen pounds. That's twelve pounds."
I think now I know how he loses weight so fast. It's a matter of the math.