we know that
A recipe that yields [tex]12[/tex] cups of soup calls for [tex]28[/tex] ounces of beef broth
so
by proportion
Find the ounces of beef broth needed to make [tex]18[/tex] cups of soup
[tex]\frac{28}{12} \frac{ounces}{cups} =\frac{x}{18} \frac{ounces}{cups} \\ \\12*x=18*28\\ \\x=18*28/12\\ \\x=42\ ounces[/tex]
therefore
the answer is
[tex]42\ ounces[/tex]
