Copia de Effect in KG when Cargo Removed from CL

The example shows the effect on ship's KG when a cargo is removed from a certain height on the centre line of the ship.
The task is to find the new cargo mass when the KG is changed to 6.65. You need to iterate a bit!
– Vidal Mestre, Kalyan Chatterjea

Information: Copia de Effect in KG when Cargo Removed from CL