Question:
Find the percentage of pure gold in 22-carat gold, if 24-carat gold is 100% pure.
Solution:
22 carat gold contains 22 parts pure gold out of 24 parts.
Also, 24 carat gold is given to be $100 \%$ pure.
$\therefore$ Percentage of pure gold in 22 carat gold $=\left(\frac{22}{24} \times 100\right) \%$
$=91 \frac{2}{3} \%$
Hence, 22 carat gold contains $91 \frac{2}{3} \%$ of pure gold.