On the drawing with a scale of 20:1, measure the length of a certain part to be 20cm, what is the actual length of the part.
在比例尺是20：1的图纸上，量得某零件长20cm，零件实际长多少．
<gadget id="calculator">20 / 1</gadget>
<output>20</output>

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

<result>1</result>