It is 83.
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The prime numbers between 70 and 80 are 71, 73, and 79.
There is no prime number between 60 and 80 that has a consecutive sum. The prime numbers between 60 and 80 are 61, 67, and 71, but none of them have consecutive sums.
The average of the prime numbers between 80 and 90 is 83.
It is: 43
97