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During the first 3 week of training, a runner runs 20 miles, 22 miles, and 21 miles. How many more miles must she run during the fourth week to have a mean of a least 22 miles per week?

Answer :

Answer:

25

Step-by-step explanation:

mean = SUM/#of values

(20+22+21+x)/4=22

solve for x

x=25

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