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Anonymous
28 + 18 = 46
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It is 46.
8, 13, 18, 23, 28, etc.
4y + 10 = -18 4y = -28 y = -7
Halfway between 18 and 28 is (18 + 28) ÷ 2 = 23.
16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
18