Let's calculate the miles Phillipa rode each day:
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Friday: \[ \text{Friday distance} = (13.5 + 8.5) \div 2 = 22 \div 2 = 11 \text{ miles} \]
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Saturday: \[ \text{Saturday distance} = 18 - (2 * 4) = 18 - 8 = 10 \text{ miles} \]
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Sunday: \[ \text{Sunday distance} = 20 - (5 - 3) = 20 - 2 = 18 \text{ miles} \]
Now we can summarize the distances:
- Friday: 11 miles
- Saturday: 10 miles
- Sunday: 18 miles
Comparing the distances, Phillipa rode her bicycle the most on Sunday with 18 miles.