math

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The amount of gold jewelry and other products is measured
in karats (K), where 24K represents pure gold. The mark 14K
on a chain indicates that the ratio between the mass of the
gold in the chain and the mass of the chain is . If a gold
ring is marked 18K and it weighs 0.4 oz, what is the value of
the gold in the ring if pure gold is valued at \$300 per oz?

• math -

18K gold is 18/24 = 75% gold, by mass.
A 0.4 oz 18K ring therefore contains 0.3 oz of gold.

Multiply 0.3 oz by \$300/oz for the gold value in the ring. The other 0.1 oz is probably copper of negligible value.

That is a rather outdated question. Gold is worth \$1100/oz these days.

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