42 storybooks and 15 pencil boxes were awarded to the story king of the school. As a result, there were 2 story books and 5 pencil boxes left. Do you know how many story kings there are at most?
把42本故事书和15个文具盒奖给学校的故事大王，结果故事书剩2本，文具盒剩5个．你知道故事大王最多有几位吗？
<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<result>10</result>