Xiaolan reads 15 pages of a story book every day, and she only read half of the book after 8 days. Later, she read 5 more pages every day, and asked Xiaolan how many days she had been reading this book.
小兰一本故事书，每天看15页，看了8天只看了这本书的一半，后来她每天多看5页，问小兰看完这本书看了多少天．
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">120 / 20</gadget>
<output>6</output>

<gadget id="calculator">6 + 8</gadget>
<output>14</output>

<result>14</result>