Xiao Ming reads a 240-page story book, and has already read (1/8) of this book, how many pages are left to be read.
小明看一本240页的故事书，已经看了这本书的(1/8)，还有多少页没看完．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">240 * (7/8)</gadget>
<output>210</output>

<result>210</result>