There are 95 story books in the library, 58 of which were lent out today, and 35 were returned. How many story books are there in the library now?
图书室有故事书95本，今天借出58本，还回35本．现在图书室有故事书多少本．
<gadget id="calculator">95 - 58</gadget>
<output>37</output>

<gadget id="calculator">37 + 35</gadget>
<output>72</output>

<result>72</result>