Will likes two brands of healthy breakfast cereal. In Superfiber cereal, there are 5 grams of fiber in one cup. In Fiber Oats cereal, there are 4 grams of fiber in one cup. Let x represent the number of cups of Superfiber Will ate this week and let y represent the number cups of Fiber Oats he ate this week. Which inequality represents the situation if the cereal Will ate this week contained at least 30 grams of fiber?
Each cup of Superfiber contributes 5 grams of fiber, so x cups contribute 5x grams. Each cup of Fiber Oats contributes 4 grams, so y cups contribute 4y grams. “At least 30 grams” means the total is 30 or more, giving 5x + 4y ≥ 30, choice A.
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