We've tried to separate fast food and math as much as we could in our professional career. However, a recent Instagram post from BroBible has piqued our burger-lovin curiousity.

BroBible posted a photo this morning that's received hundreds of comments.

The graphic features a pretty standard algebra problem that replaces variables with McDonald's items like burgers, fries, and a drink.

Here's the problem:

BroBible's Instagram followers immediately set to work, solving the problem with the speed and efficiency of an actual McDonald's drive-thru.

Take a second, can you figure it out?

We sat down with Foodbeast's resident mathematician and food scientist, Constantine Spyrou who solved it seconds.

It's 15.

Man, we've forgotten so much basic math since college. We're gonna take a minute and appreciate how little math we actually need in this profession.