Xiao Ming reads a story book, and reads 45 pages in 3 days. According to this calculation, after 5 days of reading, he will read the complete book. How many pages does this storybook have?
小明看一本故事书，3天看了45页，照这样计算，再看5天就正好看完全书．这本故事书有多少页？
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<result>120</result>