Question:
An alloy contains 32% copper, 40% nickel and rest zinc. Find the mass of the zinc in 1 kg of the alloy.
Solution:
Percentage of copper in the alloy $=32$
Percentage of nickel in the alloy $=40$
Percentage of zinc in the alloy $=100-32-40=28$
$\therefore$ Amount of zinc in $1 \mathrm{~kg}$ of the alloy $=(0.28 \times 1) \mathrm{kg}$
$=280 \mathrm{gm}$
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