Mr. Li has typed 900 words for an article, and there are (2/5) left to finish. How many words are there in this article?
李老师打一篇文章，已经打了900个字，还剩(2/5)没打完．这篇文章一共有多少字？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">900 / (3/5)</gadget>
<output>1_500</output>

<result>1_500</result>