Li Hua reads a storybook and plans to read 10 pages a day, which can be finished in 18 days. If it takes 6 days to finish, how many pages do he read every day? (Solve with ratio)
李华看一本故事书，计划每天看10页，18天可以看完，如果要6天完成，每天看多少页？(用比例解)
<gadget id="calculator">10 * 18</gadget>
<output>180</output>

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

<result>30</result>