116.5 is the average.
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123.5 is the average.
15 + 80/90 = 143/9 = 15.888
106.5 143 plus 70 is 213, divided by 2 is 106.5
The average of 90 and 100 is 95.
7/10 + 8/9 = 7(9)/90 + 8(10) / 90 = 63/90 + 80/90 = 143/90 = 1 53/90