Food and other items are generally measured in a system of weight called Avoirdupois. This system uses pounds and ounces. Precious metals like gold and silver, are bought and sold by Troy weight, measured in grains and pennyweights. Here is a conversion table from pounds to troys, from troys to pennyweights, and so on.
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Now if 1 ounce Avoirdupois = 437.5 Troy grains, how many pennyweights would you need to weight out four onces of candy?
