Question

The average of 15 numbers is 84. The first seven numbers and the last five numbers have averages of 92.5 and 72.5, respectively. The ninth number exceeds the eighth number by 20%, and the tenth number is reduced by (50/9)% from the ninth number. Determine the value of the ninth number.

A 90
B 80
C 85
D 75
E 115
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