dictionary is 40 mm thick, and a math book is 5 mm thick. How many math books are as thick as a dictionary?
一本字典厚40毫米，一本数学书厚5毫米，几本数学书的厚度与一本字典的厚度一样？
<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<result>8</result>