Mathematics, 20.02.2020 01:00 genyjoannerubiera
If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30, what is the average of x and y?
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If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30,...
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