Math find missing angles

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1. 102 + 40 = 142, 180 - 142 = 38

2. 90 + 19 = 109 = 71, 180 - 109 = 71

3. 65 + 15 + 20 = 95, 180 - 90 = 80

4. 43 + 75 = 118, 180 - 118 = 62

5. 180 - 70 = 110, 110 divided by 2 = 55

6. 180 divided by 3 = 60 because 60 + 60 = 120 + 60 = 180 so the answer is 60