On a drawing with a scale of 20:1, the length of a precision part is measured to be 5mm, so how many decimeters should the length of the part be when the worker uncle processes the part.
在一幅比例尺是20：1的图纸上，量得一精密零件的长度是5毫米，那么工人叔叔在加工这个零件时的长度应为多少分米．
<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">5 / 20 / 100</gadget>
<output>1/400 = around 0.0025</output>

<result>1/400 = around 0.0025</result>