10 and 1/8 pounds
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Find out how many oz there are in a pound and then divide this number into 720 oz to convert it into pounds.
3 and 1/8 pounds
1 pound (lb) = 16 ounces (oz) Therefore n lb = n x 16 oz where n is the number of pounds. So if n = 5 pounds, that would be 5 x 16 oz or 80 oz
(7 pounds 3 oz) - (10 pounds 5 oz) = -3.125 pounds
8.0 oz is 0.5 pounds.