The typist needs to type a manuscript, and has already typed 120 pages, exactly 40% of the manuscript. How many pages are there in total?
打字员要打一份稿件，已经打了120页，正好打了这份稿件的40%，这份稿件一共有多少页？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>