A watch part is 5mm, how many centimeters should it draw on a map with a scale of 20:1?
一个钟表零件是5mm，把它画在比例尺是20：1的地图上，应画多少cm．
<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>