Nikki is trying to solve the "rocket science" problem to get free beer, Kristen's bro is helping and Rob is cheering them on:
She couldn't solve it, turns to ask Kristen what 3 times 5 is.
Kristen is thinking: "Is she for real? We should've stopped her at 5 beers"
The big guy next to Kristen is VERY interested or is trying to multiply 3x5.
Kristen's bro is over it.
And Rob is just bored :)