ATQ, (? + 180 + 13 X 6) ÷ 20 + 3.5 X 512(1/3) = 82 (? + 180 + 13 X 6) ÷ 20 + 3.5 X 8 = 64 (? + 180 + 78) ÷ 20 = 64 - 28 (? + 180 + 78) = 36 X 20 ? = 720 - (180 + 78) ? = 462
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