A "Story Book" has 86 pages. Xiaoyu read 36 pages on the first day and 42 pages on the second day. How many pages are left?
一本《故事书》86页，小雨第一天看了36页，第二天看了42页，还剩多少页没有看？
<gadget id="calculator">36 + 42</gadget>
<output>78</output>

<gadget id="calculator">86 - 78</gadget>
<output>8</output>

<result>8</result>