Lili reads a book with 240 pages in total. She has already read 40% of the book. How many pages are left?
丽丽看一本书共240页，她已经看了这本书的40%，还剩多少页．
<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">240 * (3/5)</gadget>
<output>144</output>

<result>144</result>