Math
posted by Kevin .
a contractor's designing one side of an office building 48 feet in length the windows are each 5 feet long and will be placed Six feet apart and 5 feet from the end of the building wall how many windows can a contractor design

You really have 38 feet to work with because of the five on each end.
each windowspace unit takes 11 feat
3 of them take up 33 feet
now we can put one last window from 33 to 38
so
4 windows. 
let xxxxx be five feet, and lllll be a five feet window, and xxxxxx six feet.
xxxxxLLLLLxxxxxxLLLLLxxxxxxLLLLLxxxxxxLLLLLxxxxx
How many windows is that? 
Thanks!