A water tank can hold 1 liter of water, if 200 ml of water is put in every second, how many seconds will it be full?
一个水缸可盛水1升，如果每秒放200毫升水，多少秒可以放满．
<gadget id="calculator">1_000 / 200</gadget>
<output>5</output>

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<result>5</result>