In 20 grams of an alloy called Duralumin, there is 0.8 g of copper, 0.1 g of manganese, 0.1 g of magnesium, and the rest is aluminium. Find the ratio of copper and aluminium.
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Duralumin (also called duraluminum, duraluminium, duralum, dural(l)ium, or dural — a portmanteau of durable and aluminium) is a trade name for one of the earliest types of age-hardenable aluminium alloys. Its use as a trade name is obsolete, and today the term mainly refers to aluminium–copper alloys, designated as the 2000 series by the International Alloy Designation System (IADS), as with 2014 and 2024 alloys used in airframe fabrication.
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