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How many letters are there in this question?

36 12 10 26

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Which environment-related holiday was first celebrated on April 22, 1970?

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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?

17 20 21 19