A solid wooden block with a uniform cross section is floating in water (density $$\rho_w$$) with a height $$h_1$$ below water. Now a flat slab of stone is placed over the wooden block but the block still floats with a height $$h_2$$ below water. Afterwards the stone is removed from the top and pasted at the bottom of the wooden block. The wooden block now floats with a height $$h_3$$ under water. Therefore, the density of the stone is