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ATQ: => (X + 1800)/(X – 1200 + X + 1800) = 8Y/11Y => (X + 1800)/(2X + 600) = 8/11 => 11(X + 1800) = 8(2X + 600) => 11X + 19800 = 16X + 4800 => 5X = 15000 => X = 3000
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