Allie has a birthday present for her brother. The length of the box that the present comes in is two times longer than the width of the box. The height of the box is 5 inches and its volume is 160 cubic inches. What is the length and width of the box?

Question

kymber · Answer

The length is two times the width, so I've labelled the length 2w, w meaning width
The height is 5, and the width is unknown.
|dw:1333646253443:dw|

The volume is 160
The volume formula is V = lwh
Plug in the amounts we know
|dw:1333647030979:dw|
Solve for W
2w multiplied by w is w² since a number times a number is that number²
Squareroot w² on both sides, since w can't be squared
Hope this helps :]