the question request you solve for A
A/5 = 15
to solve this question, you'll need to understand some basic division and multiplication
[tex]\begin{gathered} \frac{a}{5}\text{ = 15 } \\ \frac{a}{5}\text{ = }\frac{15}{1} \\ \text{cross multiply and make a the subject } \\ a\text{ }\times\text{ 1 = 15 }\times\text{ 5 } \\ a\text{ = 75} \\ \text{note: any number multiplied by or divided by 1 is still that same number} \end{gathered}[/tex]a = 75