There are 6 units in one building, and each unit houses 18 households. Last year, the building saved 432 tons of water. How many tons of water does each household save on average?
一栋楼共有6个单元，每个单元住18户，去年这栋楼共节约用水432吨，平均每户节约用水多少吨？
<gadget id="calculator">432 / 6 / 18</gadget>
<output>4</output>

<result>4</result>