The library lent out 18 storybooks and returned 24. Now there are 65 storybooks in the library. How many storybooks were there in the library?
图书室借出18本故事书，还回24本，现在图书馆有65本故事书，图书室原来有多少本故事书？
<gadget id="calculator">65 - 24</gadget>
<output>41</output>

<gadget id="calculator">41 + 18</gadget>
<output>59</output>

<result>59</result>