There are 98 storybooks in the library, 46 were lent out today, and 25 were returned. How many storybooks are there now?
图书室里有故事书98本，今天借出46本，还回25本，现在故事书有多少本？
<gadget id="calculator">98 - 46</gadget>
<output>52</output>

<gadget id="calculator">52 + 25</gadget>
<output>77</output>

<result>77</result>