Your number seemed very low from my experiences, so I took a look at your link and found this:
"According to recent studies, the difference between student-teacher ratio and average class size in K-3 is 9 or 10 students "
So in reality it's closer to 30 kids per classroom.
It appears you have no idea what 1st, 2nd, and 3rd world means. It is a cold war relic that refers to alignment not development. 1st world: USA, UK, etc, 2nd world: USSR and China, and 3rd world was everyone else that didn't pick a side.