an alloy contains 40℅ of copper, 32℅ of nickel and rest zinc. find the mass of zinc in 1 kg of the alloy.
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Let the % be x.
40 + 32 + x = 100
72 + x = 100
x = 100 - 72
x = 28.
Given, Mass = 1 Kg
So, mass of zinc = 28 / 100
= 0.28 Kg.
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