Answer:
4.5 cups of spinach
Step-by-step explanation:
we know that
The recipe serves 12 people and calls for 3 cups of spinach
so
using proportion
Find out how many cups of spinach should you use, to serve 18 people
[tex]\frac{12}{3}\ \frac{people}{cups} =\frac{18}{x}\ \frac{people}{cups}\\\\x=18(3)/12\\\\x=4.5\ cups[/tex]