Hi there. This is a maths query rather than a question for technical advice. A customer has asked me to make a ring from sentimental gold of which there is 13g of 22ct gold. I need to add a quantity of 9ct to make it 18ct. How do I calculate this quantity? This has never been my strong point - I shall stick to making jewellery!! I'd really appreciate an answer fairly quickly as it's the customers wedding band and there are deadlines to be met! Many thanks in anticipation!
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