Ok so you need to multiply the length, width, and height together for each one. Bill: 8 x 20 x 6 = 960 Martin: 4 x 15 x 16 = 960 So Bill is right, they both have the same volume.
Bill is correct because to find the volume of a rectangular prism you have to find the area of the base which is length times width and then you have to multiply it by the height. I did that with the two boxes of makers and the both equal 960 cm cubed, which means bill was right.