A part is 8 mm long and the scale is 20:1. What is the length in mm drawn on the drawing?
一个零件长8毫米，比例尺是20：1，画在图纸上的长是多少毫米．
<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">8 * 20</gadget>
<output>160</output>

<result>160</result>