On the drawing with a scale of 20:1, measure the part on the drawing to be 20 cm, what is the actual length of the part in cm.
在比例尺是20：1的图纸上，量得图上零件是20厘米，零件的实际长度是多少厘米．
<gadget id="calculator">20 / 1</gadget>
<output>20</output>

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

<result>1</result>