Use a scale of 50:1 to draw a picture. The length of a part is 25 cm on the picture. What is the actual length?
用50：1的比例尺画图，一个零件在图上长25厘米，实际长多少．
<gadget id="calculator">50 / 1</gadget>
<output>50</output>

<gadget id="calculator">25 / 50</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>