60
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Supplementary angles add up to 180° → supplementary to 30° is 180° - 30° = 150°. Complementary angles add up to 90° → complementary to 30° is 90° - 30° = 60°.
21/30 + 8/30 = 29/30
35
The answer is: 20/2 plus 30 = 40
Half is the same thing as .5 so you divide 30 by .5 and you get 60 then you add 10 so it is 70. TADA!!!