Question : The ratio of copper and zinc in brass is 7 : 3. How much amount of copper will be there in 200 kg of brass?
Option 1: 60 kg
Option 2: 120 kg
Option 3: 160 kg
Option 4: 140 kg
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Correct Answer: 140 kg
Solution : The total parts in the ratio = 7 + 3 = 10 ⇒ Copper in the ratio = $\frac{7}{10}$ ⇒ Amount of copper = $\frac{7} {10}×$ total weight of brass ⇒ Amount of copper = $\frac{7} {10}×$ 200 = 140 kg Hence, the correct answer is 140 kg.
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