Answer: 9 green peppers and 3 red peppers
Explanation:
Lupe makes 12 servings:
She uses 12 green peppers and 4 red peppers.
If you want to know the number of each pepper that she needs for servings, you must divide the number of peppers by the number of servings:
green : 12/12 = 1
She needs one green pepper for serving:
red: 4/12 = 1/3
She needs one third of a red pepper for serving, so for 9 servings she needs:
9*1 = 9 green peppers
9*(1/3) = 9/3 = 3 red peppers