Xiaoxiao originally planned to finish reading a storybook in 24 days, but actually read 10 more pages per day than originally planned, and ended up finishing the book in only 15 days. How many pages does the book have?
笑笑原计划用24天看完一本故事书，实际平均每天比原计划多看10页，结果只用15天就把书看完，这本书共有多少页？
<gadget id="calculator">10 * 15</gadget>
<output>150</output>

<gadget id="calculator">24 - 15</gadget>
<output>9</output>

<gadget id="calculator">150 / 9</gadget>
<output>50/3 = around 16.666667</output>

<gadget id="calculator">24 * (50/3)</gadget>
<output>400</output>

<result>400</result>