The scale of a design drawing is 20:1, a part is 2 mm long, how many centimeters is it drawn on the drawing.
一张设计图的比例尺是20：1，一个零件长2毫米，画在图上长多少厘米．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<result>4</result>