The ratio of a number x to 0.2 is equal to the ratio of 50 to 20.
一个数x和0.2的比等于50和20的比．
<gadget id="calculator">0.2 / 20</gadget>
<output>0.01</output>

<gadget id="calculator">50 * 0.01</gadget>
<output>0.5</output>

<result>0.5</result>