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we can say that Quantity of Copper in 448 ml of mixture = (9/14) × 448 = 288 ml Quantity of Gold in 448 ml of mixture = 448 – 288 = 160 ml According to question; (288 + a + 12)/(160 + a – 10) = 12/7 Or, (300 + a)/(a + 150) = 12/7 Or, 2100 + 7a = 12a + 1800 Or, 5a = 300 Or, a = 60 So, a + 32 = 60 + 32 = 92
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