There are two bookshelves. If 20% of the books on shelf A are moved to shelf B, then the number of books on the two shelves is equal. It turns out that the number of books on A bookshelf is more than that of B bookshelf?
有两个书架，如果把甲书架上20%的书搬到乙书架上，那么两个书架上书的本数相等．原来甲书架上的本数比乙书架多几分之几？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 * (1/5) * 2</gadget>
<output>40</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 * (1/10)</gadget>
<output>10</output>

<gadget id="calculator">100 - 10 - 10</gadget>
<output>80</output>

<gadget id="calculator">40 / 80</gadget>
<output>1/2 = around 0.5</output>

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