A book of "Fairy Tales" has 198 pages, and Xiaoqiang read 45 pages in 5 days. According to this calculation, how many days will it take Xiaoqiang to finish reading this book? (Answer with proportional knowledge)
一本《童话故事》书共有198页，小强5天看了45页，照这样计算，小强读完这本书还要用多少天？(用比例知识解答)
<gadget id="calculator">198 - 45</gadget>
<output>153</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<gadget id="calculator">153 / 9</gadget>
<output>17</output>

<result>17</result>