A manuscript has been completed (3/4), and there are 900 words left. How many words are there in this manuscript?
一份稿件，已经完成了(3/4)，还剩900字，这份稿件共有多少字？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">900 / (1/4)</gadget>
<output>3_600</output>

<result>3_600</result>