I need "3 dimensional figures that have a volume of 12, and a volume of 80. I need the volume used to figure out the total volume

For the first you could do a 3 dimensional triangle with length of 3, width of 2, and height of 2. For the second you could do a rectangle with a length of 10, width of 2, and height of 4. Resulting in the volume of the triangle being 12 and the volume of the rectangle being 80. Is that what you meant?