There are about 100 calories in 30 grams of Swiss cheese. Ruth ate 70 grams of this cheese. About how many calories were in the cheese that she ate if the number of calories varies directly as the weight of the cheese?

Because calories vary directly with weight, multiply the calories per gram by the weight Ruth ate: (100 ÷ 30) × 70 ≈ 233.3. So the cheese contained about 233 calories, which is choice D.

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