The phrase "640 oz" has no weight.
An object that weighs 640 ounces weighs 40pounds.
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0.01 pounds.
8 oz
1 lbs = 16 oz so 6 lbs 8 oz + 10 lbs 12 oz = 17 lbs 2 oz
It weighs one ounce.
1 pound (lbs) = 16 ounces7 lbs 6 oz + 4 lbs 10 oz = 12 lbs