One person brushes his teeth twice a day on average, and wastes 1.2 liters of water each time, so 500,000 people waste about tens of thousands of liters of water every day.
一人平均每天刷牙两次，每次浪费水1.2升，那么500000人每天浪费水约多少万升．
<gadget id="calculator">1.2 * 1_000_000</gadget>
<output>1_200_000</output>

<gadget id="calculator">1_200_000 / 10_000</gadget>
<output>120</output>

<result>120</result>