Xiaojun read a story book, 42 pages in total on the first day, 43 pages in total on the second day, 17% of the whole book in two days. How many pages does this storybook have?
小军读一本故事书，第一天共读42页，第二天共读43页，两天读了全书的17%．这本故事书共有多少页？
<gadget id="calculator">42 + 43</gadget>
<output>85</output>

<gadget id="calculator">17 / 100</gadget>
<output>17/100 = around 0.17</output>

<gadget id="calculator">85 / (17/100)</gadget>
<output>500</output>

<result>500</result>