Question

Pure gold known as 24 carat gold. It is very soft. In order to make jewellery, it mix with silver or copper. In India 22 carat Au is used for making ornaments. What is the percentage of Au present in 18 carat Au?

Answer 1

% of Au in 18 carat gold
$\: \: \: \: \frac{18}{24} \times 100 \\ = 33 \frac{1}{3}\%.$





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Answer 2

in 24 carat of gold => 100% of gold present

in 1 carat of gold => 100/24 of gold present

in 18 carat of gold => (100*18)/24 of gold present

                            =75 % of gold