An ocean-going ferryboat is 4.38 m wide and 6.53 m long. When a truck pulls onto it, the boat sinks 6.36 cm in the water.
What is the weight of the truck?
volume of water displaced is
4.3m * 6.53m * 6.36cm
= 430cm * 653cm * 6.36cm = 1785824cm^3
If you can find the density of oceanic salt-water, you can get the mass (g) of the water displaced.
Convert to kg and multiply by 9.8 to get the weight.