An alloy is composed of nickel, zinc, and copper in a ratio of 3:4:13. How many kilograms of each metal are needed to make 4 kg of this alloy?
assuming that it is 3/4/13 by mass and not by atoms:
3x + 4x + 13 x = 4 kg
20 x = 4
x = .2 kg
Ni = 3x = .6 kg
Zn = 4x = .8 kg
Cu =13x = 2.6 kg
0.6 kilogram of nickel
0.8 kilograms of zinc
2.6 kilograms of copper
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