Answer is 26
Hope it help you !!
<span>The square framed poster has an area of 9 square feet making the dimensions of the poster 3 feet by 3 feet. Drew's box is a cube with a total volume of 30 cubic feet. This fives a dimension of 3.1 feet on a side. Therefore the poster will fit inside the box.</span>
The end of the bar should end in the exact middle of 8 and 10.
Hope this helps! :)