Question

Kim uses two cups of nuts for every 3 cups of raisins to make trail mix how many cups of nuts will she need if she uses 12 cups of raisins

Answer 1

She will need 8 cups of nuts..

Answer 2

Since you had 3 cups of raisins, then you had 12, you are multiplying the original recipe by 4. 3 times 4 = 12
2 times 4 = 8
So one would need 8 cups of nuts.