Ello can anyone answer this? I don't rlly get it =v= and before you say "How does she not get this?"
Im dum- so yeh

Volume of rectangular prism = 1 1/3 x 5/6 x 2/3 = 4/3 x 5/6 x 2/3 = 20/27

Volume of cube = 1/6 x 1/6 x 1/6 = 1/216

Number of cubes that will pack the rectangular prism = 20/27 / 1/216 = 160
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Possibly ,_, I’m not that smart either