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Because 60 is the smallest number that both 12 and 20 will divide into evenly.
When you add the values 3, 5, 8, 12 and 20 and then divide by the number of values, the result is 9.6 This is called the mean, or the average. 9.5 is called "the mistake."
You divide by 20.
10
It is 300 because 300/15 = 20