A piece of cheese weighing 2 1/2 ounces provides 240 calories. How many calories are in 1 ounce?

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Multiple Choice

A piece of cheese weighing 2 1/2 ounces provides 240 calories. How many calories are in 1 ounce?

Explanation:
Finding the unit rate of calories per ounce. If 2 1/2 ounces contain 240 calories, then one ounce has 240 ÷ 2.5 calories. Computing gives 96 calories per ounce (since 2 1/2 is 5/2, 240 ÷ (5/2) = 240 × 2/5 = 96). This checks because 96 × 2.5 = 240. If the per-ounce value were different, multiplying by 2.5 would yield a different total for 2 1/2 ounces.

Finding the unit rate of calories per ounce. If 2 1/2 ounces contain 240 calories, then one ounce has 240 ÷ 2.5 calories. Computing gives 96 calories per ounce (since 2 1/2 is 5/2, 240 ÷ (5/2) = 240 × 2/5 = 96). This checks because 96 × 2.5 = 240. If the per-ounce value were different, multiplying by 2.5 would yield a different total for 2 1/2 ounces.

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