The scale of a picture is 30:1, and the distance of 6cm is measured on this picture, how many cm is it actually
一幅图的比例尺是30：1，在这幅图上量得6cm的距离，实际是多少cm
<gadget id="calculator">6 / 30</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>