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Joe′s café

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Question

At Joe′s café, one cup of coffee and three doughnuts cost $3.90, and two cups of coffee and two

doughnuts cost $4.20. You may find it helpful to use this diagram that was used by a student to solve this problem.

a. What is the cost of one doughnut?

b. What is the cost of one cup of coffee?

 
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