A storybook has 280 pages. Liangliang has been reading it for 5 days, with an average of 20 pages per day. The remaining pages are 10 more pages per day. How many days will it take to finish this storybook?
一本故事书有280页，亮亮已经看了5天，平均每天看20页，剩下的每天比原来多看10页，看完这本故事书还要多少天？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">280 - 100</gadget>
<output>180</output>

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

<gadget id="calculator">180 / 30</gadget>
<output>6</output>

<result>6</result>