Question 347394
How about this: If we let w = number of slices of pizza that Walter wants, then 28-w is the number of slices left over. Now if you have 3 people vying for those leftovers, then they will each get {{{(28-w)/3}}} slices of pizza. 


Ex: If Walter wants one slice, then w=1 and the three get {{{(28-1)/3=27/3=9}}} slices of pizza each.