The scale of a precision part drawing is 40:1, and the length of the part measured on the drawing is 18 cm. How many centimeters is this part actually long?
一张精密零件图纸的比例尺是40：1，在图纸上量得零件的长是18厘米．这个零件实际长多少厘米？
<gadget id="calculator">10 / 40</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">18 * (1/4)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>