Xiaoli reads a story book, plans to read 20 pages a day, reads it in 30 days, and actually reads 25 pages a day. Can I watch it a few days in advance?
小丽看一本故事书，计划每天看20页，30天看完，实际每天看25页．可以提前几天看完？
<gadget id="calculator">30 / 25</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">20 * (6/5)</gadget>
<output>24</output>

<gadget id="calculator">30 - 24</gadget>
<output>6</output>

<result>6</result>