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Q.
$18$ carat gold contains
Chhattisgarh PMTChhattisgarh PMT 2007
Solution:
The weight of gold in jewellery is expressed in carats. It simply implies the number of parts by weight of gold in $24$ parts by weight of the alloy.
Pure gold is $24$ carats. $18$ carat gold means that it contains $18$ parts by weight of pure gold in $24$ parts by weight of the alloy.
Percentage of gold $=\frac{18}{24} \times 100$
Percentage of gold $=75 \%$