Im confused by this question: A block of wood floats above water with 90% of its volume submerged. Oil with a density of 875kg/m^3 is then poured over the block so that it covers the entire block. Find the fraction of the block now submerged in water. I know that the fraction of the block submerged will decrease. I started by recognizing that the initial force of buoyancy is equal to the final force of buoyancy ρ_w g(0.9)V=ρ_w gxV+ρ_o g(1-x)V Where the V and g cancel out, and the x is equal to the portion of the volume submerged in the water and the oil. However, when i use this method, x equals 0.9, meaning that the same amount of the block is submerged in the water, when it should be less of the block is submerged in the water. Please help!