1, 3, 9, 23, 69, 207.
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209
To find the average of a set of numbers, you add all the numbers together and then divide by the total number of values. In this case, the sum of 124, 148, 207, and 21 is 500. Since there are 4 numbers in the set, you divide 500 by 4 to get an average of 125.
45
Nine times.
3 with remainder 39.