A story book has 320 pages, I have read (7/8), how many pages are left?
一本故事书有320页，已经看了(7/8)，还剩多少页？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 - (7/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">320 * (1/8)</gadget>
<output>40</output>

<result>40</result>