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There are a number of solutions (using whole integers)
1+14
2+13
3+12
4+11
5+10
6+9
7+8
15
15 and -3
To find the average or mean - Add all the numbers together and divide by the amount of numbers you added: So 16 + 29 + 15 = 60 (1) (2) (3) <- So 3 numbers added together 60 / 3 = 20. So the average of 16, 29, and 15 is 20.
The pair of numbers are 15 and 2, or -2 and -15 15 - 2 = 13 15 x 2 = 30 -2 - (-15) = -2 + 15 = 13 (-2)(-15) = 30
The two numbers that equal 31 are 15 and 16. These numbers are consecutive integers, with 15 being the smaller number and 16 being the larger number. When added together, 15 + 16 equals 31.