According to the data, a person brushes his teeth twice a day on average, and it takes about two minutes to turn on the faucet from the beginning of brushing his teeth to closing the faucet at the end of brushing his teeth, and waste 1.2 liters of water, so 5,000,000 people waste about tens of thousands of liters of water every day.
由资料得，一人平均每天刷牙两次，每次从刷牙开始打开水龙头到刷牙结束关闭水龙头大约用时两分钟，浪费水1.2升，那么5000000人每天浪费水约多少万升．
<gadget id="calculator">1.2 * 10_000_000</gadget>
<output>12_000_000</output>

<gadget id="calculator">12_000_000 / 10_000</gadget>
<output>1_200</output>

<result>1_200</result>