Question 1176148
The bottom surface will have dimensions  39-2x  and 23-2x.


Two opposite side surfaces have dimensions x and 39-2x.


The other two opposite side surfaces have dimensions x and 23-2x.



The outside surface area of the box:

{{{(39-2x)(23-2x)+2x(39-2x)+2x(23-2x)}}}.  You should simplify this before finding x for the total area of 888 square inches.