An alloy contains 30% copper, 42% nickel and rest zinc.

Question:

An alloy contains 30% copper, 42% nickel and rest zinc. Find the mass of zinc in 1 kg of alloy.

Solution:

Percentage of copper $=30 \%$

Percentage of nickel $=42 \%$

Percentage of zinc $=\{100-(30+42)\} \%$

= 28%

$\therefore$ Mass of zinc in $1 \mathrm{~kg}$ of the alloy $=\left(\frac{28}{100} \times 1\right) \mathrm{kg}=0.28 \mathrm{~kg}=280 \mathrm{~g}$

 

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