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Q: What 2 prime numbers add up to 81?

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All of the prime numbers (except 2) are odd. The sum of any two prime numbers (except 2) will be even. Unless 245 is a prime number (it isn't) your question does not have a solution.

You add up the numbers, then divide by how many numbers you added. Here there are 4 numbers to add up: 81+83+87+85. Use a calculator or do longhand. Then divide the sum by 4 to get the average.