Reindeer are fed 2 cups of corn for every 3 cups of grain. If you have 12 cups of corn, how many cups of grain need to be added? S cups
1 cup
9 cups
13 cups

Answer = 13 cups

Step-by-step explanation :

2:3 ratio ( for every 2 cups of corn, there is 3 cups of grain )

12 divided by 2 = 6

6 x 3 ( for every 2 cups of corn, there is 3 cups of grain )

= 13

( if you need further explanation let me know )