Whats the rules of keep change flip

With Fractions? For example in 1/2 divided by 2/3 what you do is you leave the first fraction alone so it stays 1/2, then you change the sign from divide to multiply so it becomes 1/2 x by and then you take the next fraction and flip it upside down so 2/3 becomes 3/2. So 1/2 divided by 2/3 becomes 1/2 x 3/2. Only works with divisions

If the pyramid fits perfectly in a cube, this means that its base is a square and its height has the same value as the side of the square. Let x be the measure of the sides of the cube. The volume of the cube (Vc),
                                    Vc = x³   ; 49 ft³ = x³    ; x = 49^(1/3)

The volume of the pyramid is,
                                Vp = (1/3)(x²)(x) = (1/3)(x³)
Substituting the known values,
                                 Vp = (1/3)((49^(1/3))³ = 16 1/3 ft³

Thus, the volume of the pyramid is approximately 16.33 ft³.