On an electronic part drawing with a scale of 20:1, the length of this electronic part drawing is measured to be 5cm. What is the actual length of this electronic part?
在一幅比例尺是20：1的电子零件图上，量得这个电子零件图的长度是5cm，这个电子零件的实际长度是多少？
<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>