Xiaoxiao reads a storybook. If you read 9 pages a day, you can finish it in 12 days. If you want to finish reading it in 6 days, how many pages do you need to read on average every day?
笑笑读一本故事书，如果每天读9页，12天可以读完，如果要6天读完，平均每天要读多少页？
<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>