This takes place in Belgium: This reminds me of a time in high-school when I was ~12 and I learned that in the USA they were allowed to have brands in school b

This takes place in Belgium: This reminds me of a time in high-school when I was ~12 and I learned that in the USA they were allowed to have brands in school books, like John buys 12 can of Pepsi, drinks 1 bottle, gives 3 away, how many does he have left. (note that I was 12 when I learned this, not that this reflects the level of math I learned at the age of 12).