Water is a precious resource. If you don’t pay attention to saving water when brushing your teeth, and keep running the tap, you will lose about 500ml of water every 10 seconds. If you brush your teeth for 3 minutes each time, how many liters will be wasted if you turn on the tap? water.
水是宝贵的资源，如果你在刷牙时不注意节约用水，一直开着水龙头，每10秒流失的水大约500毫升，如果你每次刷牙用3分钟，如果开着水龙头将会浪费多少升的水．
<gadget id="calculator">500 / 10</gadget>
<output>50</output>

<gadget id="calculator">60 / 1_000</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">50 * 3 * (3/50)</gadget>
<output>9</output>

<result>9</result>