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? Think carefully first, then make a decision:
To have five 3 - piece sets, he needs to have a total of 5 * 3 = 15 shoes,. If he already owns three shoes, then he needs to buy 15 - 3 = 12 additional shoes. Since each pair of shoes includes two shoes, he needs to buy a total of 12 / 2 = 6 pairs of shoes. So, the answer is 6.