Question

Most people sleeps about 8 hours in a day. Then what part of a day is it?

Answer 1

There are 24 hours in a day.
Most people sleep 8 hours in a day.
Fraction of a day for which the people sleep = $\frac{8}{24}$
$\begin{array}{cc}\frac{8}{24}& =\frac{8}{24}÷\frac{8}{8}\\ & =\frac{8÷8}{24÷8}\\ & =\frac{1}{3}\text{part of a day}\end{array}$

Thus, mostly people sleep $\frac{1}{3}$ part of a day.