Problem $3$: Determine the difference in pressure at the center of spheres, A and B when the fluid in AC and DB is kerosone and the fluid between CD is mercury. The specific gravity of kerosene is $0\mathrm{.}82$ and the specific gravity of mercury as $13\mathrm{.}55.[$Hint calculate the density of each fluid first, use density of water as $1000k\frac{g}{m^3}]$