There used to be some story books in the book corner, which were lent to 3 groups, 18 in each group, and 35 were left. How many story books were there?
图书角原来有一些故事书，借给3个小组，每组18本，还剩35本．原来有多少本故事书？
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

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

<result>89</result>