Answer:
2718 square inches
Explanation:
Since he's applying stain (painting) he must be doing only the surface.
Finding the surface area:
33x18=594
33x15=495
18x15=270
594+495+270=
1359 square inches
We will then x2 1359 since we found the area for 1/2 of the box.
It is: 2718