Austin has 10 pairs of dress shoes he needs to polish over the weekend. If he has polished 45% of individual shoes, how many more shoes does he need to polish? Let's answer step by step:
He has 10 pairs of shoes and each pair is made of 2 individual shoes for a total of 10 * 2 = 20 shoes. He has already polished 45% of the 20 individual shoes so he has polished .45 * 20 = 9 shoes. He has 20 shoes and has already polished 9 shoes so he has 20 - 9 = 11 more shoes to polish. The answer: 11.