1x 1 inch cube has volume 1in³, so 180 of these cubes can fit in a 180in³ space.
There is no single solution but there is a group of solutions also known as the interval.

This can be written with an interval.

Hope this helps.
r3t40
I believe its C.
Im not 100% sure tho
Let the number be x.
x*x*x = 54
x³ = 54 Taking cube roots
x = ∛54
x ≈ 3.780