Question

The surface area of a box is 160. The length of the box is twice its width as well as 4 less than its height. How many units are in the height of the box? (The surface area of a box is the sum of the areas of all 6 of its rectangular faces.)

Answer 1

If the width, length, height are x,y,z then you know that

2(xy+xz+yz) = 160
y = 2x
y = z-4

Now just make some substitutions, and you will find that z=9

Answer 2

good job

Answer 3

noice