Xiaohua reads a story book, and has already read 56 pages. The ratio of the number of pages read to the number of remaining pages is exactly 7:8. How many pages does Xiaohua have left?
小华看一本故事书，已经看了56页，已看的页数与剩下页数的比正好是7：8，小华还剩多少页没看？
<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">56 / (7/15)</gadget>
<output>120</output>

<gadget id="calculator">120 - 56</gadget>
<output>64</output>

<result>64</result>