A book has 200 pages. I read (5/8) of this book on the first day. How many pages are left?
一本书有200页，第一天看了这本书的(5/8)，还剩多少页没看？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">200 * (3/8)</gadget>
<output>75</output>

<result>75</result>