On a drawing with a scale of 20:1, the length of a part is 8 cm. How many millimeters is this part actually long?
在一张比例尺为20：1的图纸上，一个零件的长度是8厘米．这个零件实际长多少毫米．
<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">8 / 20</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 10</gadget>
<output>4</output>

<result>4</result>