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2020 AMC 10AProblem 2P1-10~1 minPrint
Ratios, Percents & AveragesStatistics & DataSet up the equation/formula and compute; no special trick needed

The numbers 3,5,7,a,3, 5, 7, a, and bb have an average (arithmetic mean) of 1515 . What is the average of aa and bb ?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.