4 An alloy is a mixture of metals. Most of the gold used in jewellery is an alloy of pure gold and other metals which are added to make the gold harder. Pure gold is 24 carats (ct), so 18 carat gold is an alloy of gold and other metals in the ratio 18: 6. In other words, 18 parts pure gold 24 and 24 other metals. (a) A jeweller makes an 18 ct gold alloy using three grams of pure gold. What mass of other ISET metals does she add? (b) An 18 ct gold chain contains four grams of pure gold. How much other metal does it contain? (c) What is the ratio of gold to other metals in 14 ct gold? (d) What is the ratio of gold to other metals in 9 ct gold?

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