If each pizza dough needs 1 [tex] \frac{1}{3} [/tex]\\
We will need to multiply 9 x 1[tex] \frac{1}{3} [/tex]\\
we will turn the fraction into a mixed fraction and we'll end up with [tex] \frac{4}{3} [/tex]\\
We multiply 9 x [tex] \frac{4}{3} [/tex]
and we end up with [tex] \frac{36}{3} = 12[/tex]
The cook need 12 cups of flour.