The source i linked to gives a breakdown of how the public school money is spent in the second section, titled 'Where are schools spending their money?' You can see that Public schools have many legitimate expenses that private schools don't, along with bureaucratic overhead.
However, the reason my school could get away with such a small ratio, even compared to other private schools that cost the same, is because it is an independent study school - I only went two days a week for a few hours a day.
Imagine you have one teacher working for 10 hours and 10 students. If each student goes all 10 hours, your ratio is 1:10. If each student goes only 1 hour, your ratio is 1:1.
However, the reason my school could get away with such a small ratio, even compared to other private schools that cost the same, is because it is an independent study school - I only went two days a week for a few hours a day.
Imagine you have one teacher working for 10 hours and 10 students. If each student goes all 10 hours, your ratio is 1:10. If each student goes only 1 hour, your ratio is 1:1.