Problem: Precious metals and gems are measured in troy weights in the English system:24 grains = 1 pennyweight (exact)20 pennyweight = 1 troy ounce (exact)12 troy ounces = 1 troy pound (exact)1 grain = 0.0648 gram1 carat = 0.200 gram b. What is the mass of a troy ounce of gold in grams and in carats?

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Precious metals and gems are measured in troy weights in the English system:

24 grains = 1 pennyweight (exact)
20 pennyweight = 1 troy ounce (exact)
12 troy ounces = 1 troy pound (exact)
1 grain = 0.0648 gram
1 carat = 0.200 gram 

b. What is the mass of a troy ounce of gold in grams and in carats?

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