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To balance the scales, the weights on each side must have the same total mass. In this case, the left side has a total mass of 10kg (1kg + 4kg + 5kg) and the right side has a total mass of 16kg (2kg + 6kg + 8kg). To balance them, you need to swap the 4kg weight on the left side with the 6kg weight on the right side. This would make both sides have a total mass of 14kg (1kg + 6kg + 5kg = 2kg + 4kg + 8kg).
5kg subtracted by 730g = -725
64% of 5kg= 64% * 5= 0.64 * 5= 3.2kg
4000g is the same as 4kg so 5kg is heavier.
About 5kg (5kg = 11.02 pounds).