After installing water-saving faucets in a residential area, 5 buildings saved a total of 262.5 tons of water in 7 days. How many tons of water can each building save per day on average?
一个居民小区安装节水龙头后，5幢7天一共节水262.5吨，平均每幢楼每天节水多少吨？
<gadget id="calculator">262.5 / 5 / 7</gadget>
<output>7.5</output>

<result>7.5</result>