Brian is participating in a 5-day cross-country biking challenge. He biked for 50, 63, 68, and 64 miles on the first four days. How many miles does he need to bike on the last day so that his average (mean)

Brian is participating in a 5-day cross-country biking challenge. He biked for

50, 63, 68, and 64 miles on the first four days. How many miles does he need to bike on the last day so that his average (mean) is 59 miles per day?

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Brian is participating in a 5-day cross-country biking challenge. He biked for 50, 63, 68, and 64 miles on the first four days. How many miles does he need to bike on the last d…

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