Heather P. answered 04/30/19
13+ Years Teaching & Tutoring Geometry in Middle/High Schools
To find the volume of any pyramid, simply multiply the Area of its Base by the Height, then divide by 3.
You should know that the Area of a Rectangle is LxW.
So your formula for this case is: V=LxWxH/3.
Now put all of the numbers you're given in the correct places and solve for W.