Xiaohong reads a story book, 15 pages a day, and needs 12 days to finish reading. How many pages are there in this storybook?
小红读一本故事书，每天读15页，需12天读完．这本故事书共几页？
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<result>180</result>