First you start off by setting up a Subtraction problem there anything common denominators of 7/8 and two over three verse 7/8 you should get 21/24 invert to over three you should get 16/24 then you would subtract those two anyway to get 5/24 I hope that was helpful get it
36 inches = half the depth of the pool , so depth of pool = 72 inches = 6 ft Volume of the cube = 6^3 = 216 cu ft weight of the water = 216 * 56 pounds = 12096 pounds