A story book has 45 pages, and Xiaohong read 18 pages in 2 days. At this speed, how many days can she finish reading?
一本故事书有45页，小红2天看了18页，照这种速度，几天可以看完？
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

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

<result>5</result>