The scale of a drawing of a machine part is 2:1. If the length of the machine part measured on the drawing is 25 cm, what is the actual length of the part in centimeters?
一个机器零件图纸的比例尺是2：1，如果图上量得机器零件长25厘米，则此零件实际长多少厘米．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>