The scale of a precision part drawing is 20:1, 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20：1，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">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">18 / 20</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>