9x+18y=200*14
x+y=200
y=200-x
9x+18(200-x)=2800
9x+3600-18x=2800
-9x=-800
x=88.9 grams
y=111.1 grams
x= 9 karat gold
y=18 karat gold
Answer: 88.9 grams of 9 karat gold must be mixed with 18 karat gold to produce 200 grams of 14 karat gold.
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It depends on the weight of the starting gold. 18 karat is 75% pure gold, and therefore a 1 gram weight of 18 karat gold would have 0.75 grams of pure gold in the alloy.
The karat is a measure of the purity of gold alloys. In the United States and Canada, the spelling karat is used, while the spelling carat is used to refer to the measure of mass for gemstones. Meanwhile, you can buy a carrot at the local farmers' market.
75 g of Gold, everything else are impurities
Different regions of the world produce different finenesses or grades (carats, Karats, or karats) of gold alloy. These vary from 8 karats (33.3% gold content) to 24 karat (99% gold content). The higher the karat, the softer the metal.Typical grades and percentages are below:8-karat (33.3)9-karat (37.5%)10-karat (41.7%)14-karat (58.5%)18-karat (75.0%)19.2-karat (80.0%)21-carat (87.5%)22-karat (91.6%)24-karat (99.0%)
Spot price of 1 troy ounce of gold on 10-05-2010 is currently US dollars $1340.00 per troy ounce. 18 karat gold is 75 percent gold, so take the TROY ounce weight for the 18 karat gold item times .75 to get the PURE 24 karat gold amount, then multiply that by 1340.1 troy ounce of 18 karat gold is worth $1005 dollars.1 troy ounce is equal to 31.1034768 grams, or 1.09714286 US ounces,(so you need MORE than one US ounce of pure 24 karat gold to get the spot price of a TROY ounce of gold!)Another AnswerYou can pick up 18 carrots at the local produce stand for less than two dollars US.