In the Avoidupoids system, 1 lb is 16 oz, so:
6 lb. + 6 oz. = 6 lb * 16 oz./lb. + 6 oz.
= 96 oz. + 6 oz.
= 102 oz.
In the Troy system, 1 lb is 12 oz, so:
6 lb. + 6 oz. = 6 lb * 12 oz./lb. + 6 oz.
= 72 oz. + 6 oz.
= 74 oz.
Don't worry about the Tower pound (12 Tower ounces), London pound (16 Troy ounces), or the merchant's pound (15 Tower ounces). They are all obsolete.
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