Teacher Wang plans to complete the input of a manuscript in 20 days. The actual input is 20,000 words per day, which is 2,000 words more than planned. How many days did it take to complete the task?
王老师计划用20天时间完成一部书稿的输入．实际每天输入20000字，比计划多2000字，实际用几天就完成了任务？
<gadget id="calculator">20_000 - 2_000</gadget>
<output>18_000</output>

<gadget id="calculator">20 / 20_000</gadget>
<output>1/1_000 = around 0.001</output>

<gadget id="calculator">18_000 * (1/1_000)</gadget>
<output>18</output>

<result>18</result>