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To do this mathematical question you need to know 1 pound = 16 ounces. So take 12 pounds & 3 ounces and change it to 11 pounds & 19 ounces. Now you are able to do the equation. 11 lbs & 19 ozs - 8 lbs & 7 ozs = 3 pounds & 12 ounces

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14y ago

What else can I help you with?