Answer:
3 cups of walnuts
Explanation:
Step 1: We have a ratio of 1 cup of walnuts to 1 cup of walnut muffins
1:1
Step 2: We are given 3 batches of walnut muffins
?:3
Step 3: We know this is a 1 to 1 ratio
3:3
Therefore you will need 3 cups of walnuts to make 3 batches of muffins