1.

An alloy contains 32% copper, 40% nickel and rest zinc. Find the mass of the zinc in 1 kg of the alloy.

Answer»

Mass of alloy = 1kg = 1000 gm 

Mass of copper in alloy \(=\frac{1000\times32}{100}\) = 320 gm

Mass of nickel in alloy \(=\frac{1000\times40}{100}\) = 400 gm

So, amount of zinc in alloy = 1000 - (320 + 400) = 1000 – 720 = 280 gm



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