James binges on Cheezits and eats 3 bags that are 2 ounces each.  There are 150 calories in an ounce of Cheezits.  He then goes for a 40-minute run and burns 12 calories per minute.  How many excess calories did he eat?
He ate 2*3=<T>multiply(2, 3)=6 ounces of cheez its
That means he ate 6*150=<T>multiply(6, 150)=900 calories
He burned 40*12=<T>multiply(40, 12)=480 calories
So he ate an excess of 900-480=<T>subtract(900, 480)=420 calories
