Feb 27, 2016 - Answer: - length X width â 4x3=12 square meter. Weight / area - 48/12= 4 ton. Answer YES. What is the density of Fresh water? 1.000; Question: - what is the density of sea water? 1.025; If the TPC = 12 Tons what is the change in draft if you load a 56 ton weight.? weight/TPC â 56/12= 4.5 cm. bodily sink.