88
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It is 87, the number halfway between the two middle numbers.
176-84=92, and half of 92 is 46.84 + 46 = 130 and 176 - 46 = 130, so 130 is halfway between 84 and 176.
84
First find a number that can be divided by 2 or 3 or 7. Between 50 and 100 the only such number is 84. The solution then is 84+1 = 85.
It is: 84