Michael is in a 6-day cross-country biking challenge. He biked for 66, 46, 49, 64 , 67 miles on the days. How many miles does he need to bike on the last day so that his average (mean) is 57 miles per day?

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You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?