Question

A student council sold 856 copies of a school yearbook, four fifths of the students at the school bought a copy , how many students did not buy a yearbook

Answer 1

I am guessing about 150 - 200 students did not buy a yearbook.

Explanation:

First let's assume that there are 1,000 or so students in the school. 856 would be a little over 4/5 of 1,000 just as 8 would be 4/5 of 10.