Answer:
[tex]\frac{3+z}{y}=A[/tex]Explanation:
The equation we have is:
[tex]3=Ay-z[/tex]Where
A = total number of cupcakes
y = total number of people
z = number of people who don't eat cakes
To solve for A we follow these steps.
Step 1: Add +z to both sides of the equation
[tex]\begin{gathered} 3+z=Ay-z+z \\ 3+z=Ay \end{gathered}[/tex]Step 2: Divide both sides of the equation by "y" to get A.
[tex]\begin{gathered} \frac{3+z}{y}=\frac{Ay}{y} \\ \\ \frac{3+z}{y}=A \end{gathered}[/tex]Answer:
[tex]\frac{3+z}{y}=A[/tex]