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I've posted my say. I know enough to sit on the sideline and await the teacher's reasoning. I am still thinking we are not being given the correct "picture" of the system to analyze. Dr. Joe

More info for those inclined to work out the conversions. English Weights: The "Grain" The basic unit of weight in the imperial system. There are 5760 grains to the Troy pound, and 7000 to the avoirdupois pound. The "Ounce" - avoirdupois Unit of weigh, equal to 437.5 grains. 16...

Hmmmm.... I'm a bit suspicious about the set-up of the question without more details about some specifics. However, I think it *is* the standards of measure issue. Bulk nails are measured in pennyweights. And there are 240 pennyweights per 1 "troy" pound. (which is less than the...