Mathematics
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The population of Littletown increases by 10% annually. If it is 31,200 now then its approx. population two year ago was?
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?