Each person eats about 6 grams of salt per day. There are 500 households in a residential area, with an average of 3 people in each household. In August 2012, how many kilograms of salt did people in this residential area eat?
每人每天大约吃6克盐，某居民区有500户人，平均每户3人，2012年8月，这个居民小区人们食用的盐共有多少千克？
<gadget id="calculator">31 / 1_000</gadget>
<output>31/1_000 = around 0.031</output>

<gadget id="calculator">500 * 6 * 3 * (31/1_000)</gadget>
<output>279</output>

<result>279</result>