Question 262156
This questions has one variable x, 

let x = the number of pairs of socks bought.

We are told that pairs of socks cost $3 / 1 pair.

Now we will lookk at the equation for the money:

Money spent on shoes + Money spent on socks = $115

{{{$82 + ($3 / 1 pair)*x = 115}}}
{{{82 + 3x = 115}}}
{{{3x = 115 - 82}}}
{{{3x = 33}}}
{{{x = 33/3}}}
{{{x = 11}}}

so the number of pairs of socks bought was 11.