Mixture of Alloys
10kg of an alloy which is 50% iron, 30% nickel and 20% copper is mixed with alloy X of the same mass. The resulting alloy, which is 30% iron, 60% nickel and 10% copper, is then mixed with 10kg of Alloy Y. The final resulting alloy is 35% iron, 55% nickel, and 10% copper. If 10kg of Alloy X is mixed with 40 kg of Alloy Y, what is the mass of the copper in the resulting alloy in kg?
The answer is 8.
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