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Sec. Ex. 23ab 1.1 Exercise 23ab At Joes 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. $3.90 oe $4.20 a. What is the cost of one doughnulars b. What is the cost of one eup of coffee? 1.05 ars
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