The number of bags that Sasha would need to fill the space around the photo box is 9 bags.
The first step is to determine the volume of the photo box. The photo box has the shape of a cuboid. A cuboid is a three-dimensional object. It has six sides and six vertices.
Volume = length x width x height
12.5 x 4.2 x 12.5 = 656.25
Bags needed - 656.25 / 75 = 9
To learn more about how to determine the volume of a cuboid, please check: https://brainly.com/question/8890358