Multiple choice

In an ally, the ratio of copper and zinc is 5:2. If 1.250kg of zinc is mixed in 17kg 500g of alloy, then the ratio of copper and zinc will be

  1. 2:1

  2. 2:3

  3. 3:2

  4. 1:2
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A Correct answer
Explanation

In 17.5 kg of alloy, the zinc amount is 2/7 × 17.5 = 5 kg, and copper is 12.5 kg. After adding 1.25 kg zinc, the ratio is 12.5:6.25 = 2:1.

AI explanation

In the original 17.5 kg of alloy, the amount of copper is (5/7) * 17.5 = 12.5 kg, and the amount of zinc is (2/7) * 17.5 = 5 kg. When 1.25 kg of zinc is added, the new quantity of zinc becomes 5 kg + 1.25 kg = 6.25 kg. The new ratio of copper to zinc is 12.5 : 6.25, which simplifies to 2 : 1.

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