There are 98 storybooks in the library, 46 were lent out today, and 52 were returned, how many storybooks are there in the library now?
图书室有故事书98本，今天借出46本，还回52本，现在图书室有故事书多少本？
<gadget id="calculator">98 - 46</gadget>
<output>52</output>

<gadget id="calculator">52 + 52</gadget>
<output>104</output>

<result>104</result>