If the length of a part is measured to be 18 mm on a plan with a scale of 10:1, what is the actual length of the part in mm?
在比例尺是10：1的平面图上量得一零件长18毫米，零件的实际长度是多少毫米．
<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">18 / 10</gadget>
<output>9/5 = around 1.8</output>

<result>9/5 = around 1.8</result>