On a drawing with a scale of 100:1, the length of a part is measured to be 30 cm. What is the actual length of the part in cm?
在一幅比例尺是100：1的图纸上，量得一个零件的长度是30厘米，这个零件的实际长度是多少厘米．
<gadget id="calculator">100 / 1</gadget>
<output>100</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>