Xiao Ming has been reading a storybook for 7 days, with an average of 25 pages per day, and can finish it in the remaining 5 days. How many pages does this book have?
小明看一本故事书，已经看了7天，平均每天看25页，剩下的5天可以看完，这本书有多少页？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">25 * 12</gadget>
<output>300</output>

<result>300</result>