We have the next information
1 cup of orange juice concentrate by 6 cups of water in order to do 7 cups of punch
We want to know how many cups of orange juice concentrate he uses in 18 cups of punch
1 cup orange juice concentrate ------ 7 cups of punch
x ------ 18 cups of punch
x is the cups of orange juice concentrate in 18 cups of punch
x can be calculated if we divide 18 between 7
[tex]x=\frac{18}{7}=2.57\text{ }[/tex]we will need 2.57 cups of orange juice concentrate
