Xiaoqiang has read 240 pages of a book, and there are (3/5) left to read. How many pages does this book have?
一本书，小强已经看了240页，还剩(3/5)没有看，这本书一共有多少页？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">240 / (2/5)</gadget>
<output>600</output>

<result>600</result>