In a recipe with 4 parts flour and 5 parts sugar, if you have 45 parts total, how many parts are sugar?

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Multiple Choice

In a recipe with 4 parts flour and 5 parts sugar, if you have 45 parts total, how many parts are sugar?

Explanation:
Think in parts. The recipe uses a 4:5 ratio of flour to sugar, so for every 9 parts total, 5 parts are sugar and 4 parts are flour. With a total of 45 parts, each part equals 45 ÷ 9 = 5. Since sugar needs 5 parts, multiply 5 by 5 to get 25 parts of sugar. As a check, flour would be 4 parts × 5 = 20, and 25 + 20 = 45, which fits the total. The other numbers don’t match the 4:5 ratio when the total is 45.

Think in parts. The recipe uses a 4:5 ratio of flour to sugar, so for every 9 parts total, 5 parts are sugar and 4 parts are flour. With a total of 45 parts, each part equals 45 ÷ 9 = 5. Since sugar needs 5 parts, multiply 5 by 5 to get 25 parts of sugar. As a check, flour would be 4 parts × 5 = 20, and 25 + 20 = 45, which fits the total. The other numbers don’t match the 4:5 ratio when the total is 45.

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