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Assuming mean average:

average = sum/number_of_items

→ 10 = sum/2

→ sum = 10 x 2 = 20

So any two numbers with a sum of 10 have a mean average of 10, eg {5, 15}, {1, 19}, {0, 20}, {-5, 25}, etc.

With the median average, for two numbers it is exactly the same as the mean average, so any pair of numbers that sum to 20 will do.

With the mode average, only the case of the pair of numbers {10, 10} will suffice.

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Q: What is the average of two number is 10?
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