Xiao Zhang, a typist, typed a manuscript by herself. She has already typed 1,800 words, and 40% of the full text is left unfinished. How many words are in the full text of this manuscript?
打字员小张独自打一份稿件，她已经打了1800个字，还剩下全文的40%没有打完，这份稿件全文多少个字？
<gadget id="calculator">40 / 100</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">1_800 / (3/5)</gadget>
<output>3_000</output>

<result>3_000</result>