Yoko is participating in a 5 -day cross-country biking challenge. She biked for 73 , 45 , 51 , and 52 miles on the first four days. How many miles does she need to bike on the last day so that her average

Yoko is participating in a 5 -day cross-country biking challenge. She biked for 73 , 45 , 51 , and 52 miles on the first four days. How many miles does she need to bike on the last day so that her average (mean) is 57 miles per day?

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