An alloy of 60% copper and 40% zinc is called brass. How much copper and zinc do you need to take to get 42 kg of brass?

Answer: You need to take 25.2 kg. copper and 16.8 kg of zinc.

Explanation: Since 42 kg of brass contains 60% copper and 40% zinc, we use the following calculations: (42×60): 100 = 25.2kg and (42×40): 100 = 16.8kg. 25.2kg + 16.8kg = 42kg

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