If using Avordupois there are 16 ounces (oz) to a pound (lb)
Therefore, 12oz x 3 = 36oz So 36oz / 16 = 3lb 4oz
7lb x 3 = 21lb, so the answer is 21lb + 3lb 4oz = 24lb 4oz
If Troy is used, there are 12oz to a pound (lb).
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7lb 12oz equates to 3.52kg
8lb 4lb 8oz + 3lb 8oz = 7lb 16oz However, 16oz = 1lb, thus 7lb 16oz = 7lb + 1lb = 8lb
It is 12/16 which you can simplify if required.
3.289 kg.
You have to convert the 1lb 5oz to all ounces and then subtract: 1lb 5oz = 21oz; 21oz - 12oz = 9oz