A typist typed a manuscript. On the first day, he typed 15 pages, and on the second day, he typed 13 pages. The number of pages typed in these two days accounted for 40% of the manuscript. How many pages does this manuscript have?
打字员打一部书稿，第一天打了15页，第二天打了13页，这两天打的页数占这部书稿的40%，这部书稿有多少页？
<gadget id="calculator">15 + 13</gadget>
<output>28</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">28 / (2/5)</gadget>
<output>70</output>

<result>70</result>