The scale of a part drawing is 25:1, the length of the part on the drawing is 50 cm, and the actual length of the part is how many decimeters.
一个零件图的比例尺为25：1，量得图纸上零件的长为50厘米，实际零件的长是多少分米．
<gadget id="calculator">25 / 1</gadget>
<output>25</output>

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

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

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