Hi- It's the first time I need to do this kind of calculation so I don't have any idea... I need to have the absolute weight of the next rat organs: spleen, liver, and kidney.

If the mean body weight of the 1st group is 353.56 g and their liver weight mean is 17.07 g, the spleen weight is 0.81 g, and the kidneys weight is 3.06 g then what's the absolute weight of each? Can you please show me the calculations/formula?

Thank you!