There are about 4 million students of a given age in America, so 16 million people of high school age, which corresponds to roughly 50 million in the developed world.
Yes, but not everything else you wrote applies to the developed world outside America. For example, 500 hours/​week is a massive overestimate of the time the average stu
Yes, but not everything else you wrote applies to the developed world outside America. For example, 500 hours/​week is a massive overestimate of the time the average stu