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A tree doubled in height each year until it reached its maximum height over the course of 10 years. How many years did it take to reach HALF its maximum height?
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Erin reads an average of 20 books per year. She read 23, 17, 20, and 19 books in four different years. How many books did Erin read in the 5th year to make it an average of exactly 20.0 per year?