Question 246116
Let x = the number of pages containing 4 pictures in the scrapbook
Let 4x = the number of pictures on all "4 picture" pages

If Ralph has a total of 55 pictures and 3 left over the equation will be set up like this:

First in words:

The number of pictures on all "4 picture" pages + leftover pictures = total pictures

{{{4x + 3 = 55}}}
{{{4x = 52}}}
{{{x = 13}}}
13 pages have 4 pictures on them