Answer:
Step-by-step explanation:
[tex]\frac{1}{2}[/tex] is mushrooms.
Now, this mushrooms [tex]\frac{2}{3}[/tex] is covered with onions.
So, in the whole pizza ,
the part for onion is-
[tex]\frac{2}{3} of \frac{1}{2} \\=\frac{2 x 1}{3x2} \\=\frac{1}{3}[/tex]
So, the answer is [tex]\frac{1}{3}[/tex]