There are an infinite number of answers to this question, when you include the negatives.
However, when just including the positive numbers, you have:
0 + 30
1 + 29
2 + 28
3 + 27
4 + 26
5 + 25
6 + 24
7 + 23
8 + 22
9 + 21
10 + 20
11 + 19
12 + 18
13 + 17
14 + 16
15 + 15
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There are infinitely many possible answers. 1 + 29 = 30
1.1 + 28.9 = 30
1.01 + 28.99 = 30
are three examples.