Question 212196
This is a combination problem.  Let x = number of towns.  


Then, C(x,2) = 28.  This will be {{{(x*(x-1))/(2*1)=28}}}

{{{(x^2 -x)/2=28}}}
{{{x^2-x=56}}}
{{{x^2 -x -56=0}}}

{{{(x-8)(x+7)=0}}}
x=8  or x= -7


Reject the negative value of x, so x=8 towns!


R^2