After Wang Hua gave Zhang Jun 18 books, they both had the same number. It turned out that Wang Hua had more books than Zhang Jun.
王华给张军18本图书后俩人一样多，原来王华比张军多多少本图书．
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>