A book has 154 pages, Xiao Fang has already read 109 pages, and the rest reads an average of 9 pages a day, how many days will it take to finish it?
一本书154页，小方已经看了109页，剩下的平均每天看9页，还需要几天看完？
<gadget id="calculator">154 - 109</gadget>
<output>45</output>

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

<result>5</result>