Answer:
[tex]\frac{1}{3}[/tex]
Step-by-step explanation:
After Susan gave away [tex]\frac{1}{3}[/tex] of the pizza, [tex]\frac{2}{3}[/tex] remains. And now of that [tex]\frac{2}{3}[/tex] of the pizza she gave away [tex]\frac{1}{2}[/tex]. Multiply those two fractions to get [tex]\frac{1}{3}[/tex].