For a family of three, if each person buys one less piece of clothing a year, a total of 17.1 kilograms of carbon dioxide can be reduced. On average, if each person buys one less piece of clothing a year, how many kilograms of carbon dioxide can be reduced?
一个三口之家，一年每人少买一件衣服，共可以减排二氧化碳17.1千克，平均每人一年少买一件衣服，可以减排二氧化碳多少千克？
<gadget id="calculator">17.1 / 3</gadget>
<output>5.7</output>

<result>5.7</result>