There are infinitely many answers.
How about 2 + sqrt(37) and 55 - sqrt(37). Add them together and what have you got?
57
So, as you can see, there are lots and lots of possible answers.
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Add all the sums, then divide by the number of sums. (ie. the average.)
you can make at least 25 sums
Well, 1 is equal to 1. 9 is equal to 9. So any number from 0 to 9. I do not think this is what is meant by the question. If you mean any number with more than one digit. There is no such number. Because 11 sums to 2. 19 sums to 10. 21 sums to 3. 29 sums to 11. 111 sums 3. 119 sums to 11. The sums do not grow as fast the increase of digits.
A combination of multiplication and sums is called arithmetic. Subtraction and division are also included in arithmetic.
57 times 57 = 3249