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Rob is 2 years older than Vivi. The sum of their ages is 106. How old is Vivi?

54 53 45 52

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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?

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