A box has a total surface area of 100. The length of the box is equal to twice its width, as well as equal to less than its height. What is the height of the box?

Let me just make sure you know the surface area formula. Post it down below

A=6 a^2? Why does it matter

A=2(wl+hl+hw)

This is the surface area formula of a rectangular box, which is what you have !

w =width, h=height, l=length