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How Many Kilograms of Brass Containing 58%58 \% Copper Must Be Melted With

Question 47

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How many kilograms of brass containing 58%58 \% copper must be melted with 10‾0 kg1 \overline{0} 0 \mathrm{~kg} of brass containing 75%75 \% copper to produce a new brass containing 70%70 \% copper?

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