Rina recipe uses 2 cups of sugar to make 2 1/2 dozen cookies. Jonah's recipe uses 2 1/4 cups of sugar to make 3 dozens cookies. Which recipe use more sugar for a dozen cookies? Why?

2 answers
Question:

Rina recipe uses 2 cups of sugar to make 2 1/2 dozen cookies. Jonah's recipe uses 2 1/4 cups of sugar to make 3 dozens cookies. Which recipe use more sugar for a dozen cookies? Why?

Answers

Let's calculate the "cups of sugar per dozen cookies" ratio:2 cups---------- = 0.8  (Rina)           2.5                                 2.25 cups------------- = 0.75 (Jonah)      3Rina uses more sugar for a dozen cookies.The key here is to "compare unit rates."

Answer:Rina's recipeStep-by-step explanation:Rina's recipeCups of sugar: 2 cupsCookies: 2 1/2 dozen cookies = 2.5 dozen cookiesRina uses 2 cups of sugar for 2.5 dozen cookies, which is equal to 2/2.5 = 0.8 cups of sugar per dozen of cookies.Jonah's recipeCups of sugar: 2 1/4 cups = 2.25 cupsCookies: 3 dozen cookiesJonah uses 2.25 cups of sugar fro 3 dozen cookies, which is equal to 2.25/3 = 0.75 cups of sugar per dozen of cookies.Rina's recipe uses more cups of sugar per dozen of cookies (0.8 vs. 0.75).

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