how much copper must be mixed with 144kgof zinc in order to make an alloy in which the ratio by weight of copper to zinc is 9:25
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let the copper be x
9 : 25 = 144 : x
x = 144 × 25 / 9
x = 16 × 25
x = 400 kg
9 : 25 = 144 : x
x = 144 × 25 / 9
x = 16 × 25
x = 400 kg
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