A simplified fraction converted to a decimal is 0.4. Now divide the numerator of this fraction by 2 and multiply the denominator by 4. What is the original fraction?
一个最简分数化成小数后是0.4，现将这个分数的分子除以2，分母乘以4，则原分数变为多少？
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">0.4 / 8</gadget>
<output>0.05</output>

<result>0.05</result>