Lili planned to finish reading the 180-page storybook in 9 days, but actually finished it in 6 days. How many more pages did she actually read every day than planned?
丽丽计划用9天时间读完180页的故事书，实际只用6天就读完了，实际每天比计划多读多少页？
<gadget id="calculator">180 / 6</gadget>
<output>30</output>

<gadget id="calculator">180 / 9</gadget>
<output>20</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<result>10</result>