A book, originally planned to read 25 pages a day, actually finished it in 6 days. Actually read 30 pages a day, how many days did it actually take to finish reading this book? (equation solution)
一本书，原计划每天看25页，6天实际看完．实际每天看30页，实际看完这本书用了多少天？(方程解)
<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<gadget id="calculator">150 / 30</gadget>
<output>5</output>

<result>5</result>