Question

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

Answer 1

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 $1kg$ of the alloy $=28\%of1kg=0.28\times 1kg=0.28kg=280gm$