Answer:
55
Explanation:
1 + 2 = 3
3 + 3 = 6
6 + 4 = 10
10 + 5 = 15
15 + 6 = 21
21 + 7 = 28
28 + 8 = 36
36 + 9 = 45
45 + 10 = 55
10 + 9 = 19 + 8 = 27 + 7 = 34 + 6 = 40 + 5 = 45 + 4 = 49 + 3 = 52 + 2 = 54 + 1 = 55
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