There are 280 books on the two bookshelves of A and B. If 12.5% of A’s bookshelf is given to B’s bookshelf, then the books on the two bookshelves are equal. How many books are there on A’s bookshelf?
甲乙两个书架上共有图书280本，如果把甲书架上的12.5%给乙书架，那么两个书架上的书相等，甲书架上原有图书多少本？
<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">1 - 0.125</gadget>
<output>0.875</output>

<gadget id="calculator">140 / 0.875</gadget>
<output>160</output>

<result>160</result>