A salsa recipe uses green pepper, onion, and tomato in the extended ratio 1:3:10. How many cups of onion are needed to make 56 cups of salsa?

To solve for the amount of onion needed to make 56 cups of salsa, add all the numbers in extended ratio. The sum is 14. Then, divide 56 by the resulting sum, 14. The quotient is 4. Lastly, multiply the quotient with the number from the extended ratio which corresponds to onion. In the given extended ratio, 3 corresponds to onion. Thus, the amount of onion needed is 12 cups.