but the police is an expression then evaluate the expression when x equals 4 and Y equals 24

Given:
5 less than a quotient of a number y and 2
That mean:
[tex]=\frac{y}{2}-5[/tex]In given question value of y is 24.
So put the value of y in above equation.
[tex]\begin{gathered} =\frac{y}{2}-5 \\ =\frac{24}{2}-5 \\ =12-5 \\ =7 \end{gathered}[/tex]