There are an infinite number of triplets.
Start with positive integers: 1 + 2 + 12, 1 + 3 + 11, etc
Then introduce negative integers: 1 + 16 - 2, 1 + 17 - 3, etc
Next try some rational fractions: 1 + 1.1 + 12.9, 1 + 1.2 + 12.8 etc
and then negatives and rational fractions: 1 + 16.1 - 2.1, 1 + 17.1 - 3.1 etc
Finally some irrationals: [1 + sqrt(3)] + [1 - sqrt(3)] + 13, etc
Each one of these groups (except the first) has an infinite number of possible solutions.
The sum of the first 5 numbers is 15. 1+2+3+4+5=15
3 and 12
12 and 3
The sum of 45 and 15 equals 60. 15 x 3 equals 45.
The numbers are 9 and -6 because 9-(-6) = 15 and 9+(-6) = 3
The numbers are 15 and 3. 15 * 3 = 45 15 + 3 = 18
The sum of the first 5 numbers is 15. 1+2+3+4+5=15
9 and 6
Six and nine
15 and 3
The numbers are: 3 and 12
The numbers are: -5 and 3
12 and 3
3 & 15
3 and 12
12 and 3
3*5=15 5*3=15 15*1=15