79.     - Tell me, famous Pythagoras, how many students attend your school and listen to your discourses?

- In all, 一 replied the philosopher: - half study mathematics, a quarter study music, a seventh part remains in silence, and, in addition, there are three women.
79. We form the equation:

$$
\frac{1}{2} x+\frac{1}{4} x+\frac{1}{7} x+3=x
$$

from which $x=28$. We can solve the following problems arithmetically as well.