The book group originally had some story books, which were lent to 3 classes, each class had 18 books, and there were 35 books left. How many story books are there?
图书小组原来有一些故事书，借给3个班，每班18本，还剩35本．原来有故事书多少本？
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 + 35</gadget>
<output>89</output>

<result>89</result>