Mr. Zhang plans to type a manuscript in 18 minutes, and type 40 characters per minute. The actual average type is 40 characters per minute. How many minutes can it be finished?
张老师计划18分钟打一份稿件，每分钟打40字，实际平均每分钟多打40个字，几分钟可打完？
<gadget id="calculator">40 + 40</gadget>
<output>80</output>

<gadget id="calculator">18 / 80</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">40 * (9/40)</gadget>
<output>9</output>

<result>9</result>