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7 July, 14:22

An alloy is composed of nickel, zinc, and copper in a 7:2:9 ratio. How many kilograms of each metal is needed to make 3.8 kg of this alloy?

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  1. 7 July, 17:18
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    Ni : Zn: Cu = 7:2:9 = 7x : 2x : 9x

    7x+2x+9x = 3.8

    18x=3.8

    x=3.8/18=1.9/9≈0.21

    Ni: 7x=7*0.21=1.47 ≈1.5 kg

    Zn: 2x=2*0.21=0.42≈0.4 kg

    Cu: 9x=9*0.21=1.89 ≈1.9 kg

    Check 1.5+0.4+1.9 = 3.8 True
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