Question: what is what does that mean (2*10 + 4*9 + 12*10 + 15*7 + 18*2 + 19*6 + 21*2) / (10 + 9 + 10

what is what does that mean (2*10 + 4*9 + 12*10 + 15*7 + 18*2 + 19*6 + 21*2) / (10 + 9 + 10 + 7 + 2 + 6 + 2)

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