1. The problem statement, all variables and given/known data A Mississippi river barge is 65m long and 20m wide. How far will it sink into the water when 3000 tonnes of coal is placed on it? 2. Relevant equations rho=m/v, L x W = A, 3. The attempt at a solution I figured out the area of the barge in contact with the water, then converted the tonnes to kilograms. I used this to get the volume of coal taken off. (I think that works). I guess from here I need to use the density of water to see how much is displaced by that amount of coal, and then determine the height of water this would correspond to. I'm stuck at this last part.