Codger is a three-footed sloth.  He has a challenging time buying shoes because the stores only sell the shoes in pairs. If he already owns the 3-piece set of shoes he is wearing, how many pairs of shoes does he need to buy to have 5 complete 3-piece sets of shoes?
To have five 3-piece sets, he needs to have a total of 5*3=
<gadget id="calculator">5*3</gadget>
<output>15</output>
15 shoes,
If he already owns three shoes, then he needs to buy 15-3=
<gadget id="calculator">15-3</gadget>
<output>12</output>
12 additional shoes.
Since each pair of shoes includes two shoes, he needs to buy a total of 12/2=
<gadget id="calculator">12/2</gadget>
<output>6</output>
6 pairs of shoes.

<result>6</result>