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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).
4000g is the same as 4kg so 5kg is heavier.
its the same weight as two 2kg objects, or four 1kg objects
One milligram (1mg) is one thousandth of a gram, and one kilogram is one thousand grams. Therefore, there are 1000x1000mg in 1kg. There are 1000000mg in 1kg, so there are 4000000mg in 4kg.
4kg = 4,000g, so 4kg is greater than 513g