When Xiao Ming reads a book, he has already read 55 pages, which is 15 pages more than the ones he has not read. How many pages do he need to read to make the unread pages account for 5/19 of the whole book?
小明看一本书，已看了55页，比未看的多15页，要使未看的页数占全书的(5/19)，还要看几页？
<gadget id="calculator">55 - 15</gadget>
<output>40</output>

<gadget id="calculator">40 + 55</gadget>
<output>95</output>

<gadget id="calculator">5 / 19</gadget>
<output>5/19 = around 0.263158</output>

<gadget id="calculator">1 - (5/19)</gadget>
<output>14/19 = around 0.736842</output>

<gadget id="calculator">95 * (14/19)</gadget>
<output>70</output>

<gadget id="calculator">70 - 55</gadget>
<output>15</output>

<result>15</result>