Answer :
We have:
Romano cheese need is 7/8 cups
Onions need is 1/4 cups
Mushrooms need is 1/8 cups
Then, onions and mushrooms combined:
[tex]\frac{1}{4}+\frac{1}{8}[/tex]multiply and divide 1/4 by 2
[tex]\begin{gathered} \frac{2}{8}+\frac{1}{8} \\ \text{and we add } \\ \frac{2+1}{8}=\frac{3}{8} \end{gathered}[/tex]Next, we subtract the romano cheese and onions and mushrooms combined:
[tex]\frac{7}{8}-\frac{3}{8}=\frac{7-3}{8}=\frac{4}{8}=\frac{1}{2}[/tex]Answer: 1/2 cups