The school organized a "Patriotic Reading Activity". Li Gang read 10% of a book on the first day, and 1/5 of the book on the second day. He read 30 pages more than the first day. how many pages (solution by equation)
学校组织"爱国主义读书活动"，李刚第一天读了一本书的10%，第二天读了这本书的(1/5)，比第一天多读30页，这本书共有多少页？(用方程解)
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">30 / (1/10)</gadget>
<output>300</output>

<result>300</result>