The scale of a drawing is 30:1, how many centimeters should a part with a length of 5 mm be drawn on the drawing.
一张图纸的比例尺是30：1，将一个长度为5毫米的零件画在图纸上应画多少厘米．
<gadget id="calculator">30 / 1</gadget>
<output>30</output>

<gadget id="calculator">0.5 * 30</gadget>
<output>15</output>

<result>15</result>