Question: Frank is training for a marathon. He chooses a training schedule that recommends he run an average of 20 miles a week, but Frank would

Frank is training for a marathon. He chooses a training schedule that recommends he run an average of 20 miles a week, but Frank would like to do more. Frank has recorded his weekly miles as follows: Week 1: 18 miles Week 2: 23 miles Week 3: 15 miles How many miles must Frank run in Week 4 for his average mileage to exceed 20 miles

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