An alloy of copper and tin contains 87.5% of copper. If 30 kg of more tin is added to the alloy, the copper content gets reduced to 50%. Find the quantity of the new alloy.
Ratio of copper to tin in the alloy = 7:1 Let the quantity of copper and tin in the alloy be 7x kg and x kg, respectively. According to question, 7x = x + 30 x = 5 kg So, the quantity of new alloy = 7x + x + 30 = 8x + 30 ⇒ 40 + 30 = 70 kg
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