The length of a part is 4 mm, and it is 20 meters on the drawing. According to this scale, what is the actual length of a part of 5 meters on the drawing?
一个零件长4毫米，图纸上是20米，照这样的比例尺，一个图上5米的零件，实际长多少．
<gadget id="calculator">20_000 / 4</gadget>
<output>5_000</output>

<gadget id="calculator">5_000 / 1</gadget>
<output>5_000</output>

<gadget id="calculator">5_000 / 5_000</gadget>
<output>1</output>

<result>1</result>