5,600 onces
There 453.59237 grams per av pound. Therefore, there are 453,592.37 mg per av pound.
If by mg you mean milligram then 1 milligram = 2.20462262 × 10-6 poundsmeaning that 1 lb = 453,592.37 mgSince the mg is a much smaller weight unit.
350 mg = 0.01235 ounces
Km is a measurement of distance and pounds are a measurement of weight. I think there maybe a typo.1 pound = 0.45359237 kilograms350 pounds = 158.7573295 kilograms