The actual length of a part is 2mm, and the part is drawn on the diagram with a scale of 20:1, what is the length in centimeters on the diagram
一个零件的实际长度是2毫米，这个零件按比例尺20：1画在图上，图上的长应是多少厘米
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">(1/5) * 20</gadget>
<output>4</output>

<result>4</result>