Two-For-One Plus Four Years Of School Equals Zero Clue

My son just graduated college and is living and working at home. I’m working from home when my son comes into my office.

Son: “Hi, Dad! I have a question for you.”

Me: “Okay, what can I do for you?”

Son: “[Girlfriend] and I are going mini-golfing tonight. We have two options: there’s an online deal for two players for the price of one, which is $12. Or we can just go and pay the regular price, which is $7 each. What’s the better deal?”

Me: “Okay, let’s do some math here. What’s seven times two?”

Son: “Fourteen.”

Me: “Right. And what’s twelve times one?”

Son: “Twelve.”

Me: “Good. And what’s larger, twelve or fourteen?”

Son: “Fourteen.”

Me: “Okay. So, what’s your goal here, to save some money or to give them more money?”

Son: “Save my money.”

Me: “Okay. So, since we know twelve is smaller than fourteen, what’s the best option to save money?”

Son: “The two-for-one deal.”

Me: “Yes.”

Son: “Well, thanks, Dad. I appreciate your help.”

Me: “Serious question, was this a troll attempt?”

Son: “No.”

He shows me a text thread where he and his girlfriend are struggling to figure out which is cheaper.

Me: “You’re never living this one down.”

Son: “Living what down?”

Me: “That after four years of college, you still have to ask your dad for help with elementary-school-level math.”

Son: “Oh.”