let
the number of car made this week = x
Therefore,
[tex]\begin{gathered} 5\text{ \% of x = 24} \\ \frac{5}{100}\times x=24 \\ \frac{5x}{100}=24 \\ \text{cross multiply} \\ 5x=2400 \\ x=\frac{2400}{5} \\ x=480 \end{gathered}[/tex]Total number of car made this week = 480