Answer:
20 cups of broth are needed to make 30 servings of the soup.
Step-by-step explanation:
This is a typical proportion math problem.
Just set up the proportion and solve for the unknown variable, let it be x, because it's simple to use.
12/8=30/x
simplify 12/8 to 3/2,
3/2=30/x
cross product,
2*30=3*x
60=3x
x=60/3
x=20
