A book has 680 pages. Xiaoyang read 328 pages on the first day and 285 pages on the second day. How many pages are left in this book?
一本书有680页，小洋第一天看了328页，第二天看了285页．这本书还有多少页没看？
<gadget id="calculator">680 - 328 - 285</gadget>
<output>67</output>

<result>67</result>