given: 8.5"*11" page with 1.5" margins on all four sides.

Question

figure the width of three that will fit evenly between the margins of the page along with .25" between each box. how wide will the boxes be to fit between the margins?

Answer 1

The 1.5" margin all around reduces the usable area to:

     (8.5 - 1.5 -1.5) x (11 - 1.5 - 1.5)

           5.5" x 8"

 

Three boxes have two spaces (of 0.25") between them.  That makes it 3x+2(0.25)  = 3x + 0.50

 

The usable width of the page:

       5.5 = 3x + 0.5

       5.0 = 3x

       5/3 = x

       x = 1 2/3"      width of each box

 

The usable height of the page:

       8 = 3y + 0.5

       7.5 = 3y

       2 1/2" = y         height of each box