Wang Ning read a 243-page storybook. He read 45 pages on the first day and 55 pages on the second day. How many pages are left?
王宁看一本243页的故事书，第一天看了45页，第二天看了55页，还剩多少页没有看？
<gadget id="calculator">45 + 55</gadget>
<output>100</output>

<gadget id="calculator">243 - 100</gadget>
<output>143</output>

<result>143</result>