Xiaoli reads a book, originally planned to read 20 pages a day, and finished it in 15 days, but actually finished it 5 days ahead of time, how many pages did she actually read every day? (Answer with proportional knowledge)
小丽看一本书，原计划每天看20页，15天看完，实际提前5天看完，实际每天看多少页？(用比例知识解答)
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<gadget id="calculator">300 / 10</gadget>
<output>30</output>

<result>30</result>