Problem: how many cubes of 5 cm edge can be cut out of a cube of 20 cm edge
Rationale: "explanation : number of cubes = ( 20 x 20 x 20 ) / ( 5 x 5 x 5 ) = 64 answer : b"
annotated_formula: divide(volume_cube(20), volume_cube(divide(5, const_100)))