rectangular part is drawn on the blueprint according to the scale of 50:1. The length of the drawn part is measured to be 20 cm, and the existing material with a width of 40 cm is exactly 40 cm. How many parts of this kind can be made?
一个长方形零件，按50：1的比例尺画在图纸上，量得所画的零件长是20厘米，现有宽度正好的材料40厘米，可以制作这种零件多少个？
<gadget id="calculator">20 / 50</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 / (2/5)</gadget>
<output>100</output>

<result>100</result>