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Answer:

The full recipe is 15 cups.

Step-by-step explanation:

3 cups is 20% of the recipe. The full recipe is 100% of the recipe. 20/100 = 1/5. 20% is 1/5 of 100%, so 3 cups is 1/5 of the full recipe. 3 * 5 = 15.

The full recipe is 15 cups.