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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

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There are 3 dozen cats that need to be adopted. There are 2 dozen dogs that need to adopted. How many dogs and cats need to be adopted in all?

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