Question
A metal alloy is composed of 25% silver, 45% gold, and
30% copper. How much silver should be added to 50 kg of the alloy to make the new alloy contain 40% silver?Solution
ATQ,
Given: Alloy weight = 50 kg Composition: Silver = 25% of 50 kg = 12.5 kg Other metals (gold + copper) = 75% = 37.5 kg We add x kg of pure silver, so: New total weight = 50+x New silver amount = 12.5+x We want silver to be 40% of the new total: 
Solving the equation: 
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