Hi, I was wondering what basic formulae can be used to solve questions like this? I haven't encountered a problem using two different densities, and no height or displacement volume given. Q. A block of ice, 100g, density 900kg m-3, is placed in a 400ml of solution A, density 1100 kg m-3. Before any ice has melted, the level of solution A is closest to? A: 490mL Thanks in advance for any help.