Question 113223
The height of the rectangular box would be, as clearly seen in the figure, 3 inches.
So area of base of the box = {{{675/3}}} = 225 sq in.
So each side of the base square of the box = {{{sqrt(225)}}} = 15 in.
So each side of the square paper is (3 + 15 + 3) = 21 in.


{{{drawing( 400, 400, -200, 200, -200, 200,

  locate( -135, -105, 3 ), locate( -115, -127, 3 ),
  locate( 0, -155, 15 ), locate( 153, 0, 15 ),
  locate(-20, 0, 21),
  locate(0, 0, X),
  locate(10, 0, 21),
  rectangle( -150, -150, 150, 150 ),
  red(rectangle( -150, 150, -120, 120 )),
  red(rectangle( -150, -150, -120, -120 )),
  red(rectangle( 150, -150, 120, -120 )),
  red(rectangle( 150, 150, 120, 120 ))

  )}}}