Question

An alloy of copper and zinc contains $45\%$ copper and the rest is zinc$.$ Find the weight of zinc in $2kg$ of the alloy$.$

Answer 1

Step $1:$ To find the weight of zinc in $2kg$ of the alloy.

It is given that percentage of copper in an alloy $=45\%$

Percentage of zinc in an alloy $=100-45$

$=55\%$

Step $2:$ Now find $55\%$ of $2kg$ of the alloy for the weight of zinc.

Weight of zinc in the alloy $=\frac{55}{100}\times 2$

$=\frac{110}{100}$

$=1.1kg$

Hence, the weight of the zinc in $2kg$ of the alloy is $1.1kg$