On a drawing with a scale of 30:1, the length of the part is measured to be 3 cm. How many millimeters is this part actually long?
在一张比例尺为30：1的图纸上，量得零件长3厘米．这个零件实际长多少毫米．
<gadget id="calculator">30 / 1</gadget>
<output>30</output>

<gadget id="calculator">3 / 30</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 10</gadget>
<output>1</output>

<result>1</result>