Teacher Liu reads an extra-curricular book. He read the whole book (1/8) on the first day and the whole book (1/10) on the second day. In two days, he read 45 pages in total. How many pages does this book have? (solution by equation)
刘老师看一本课外书，第一天看了全书(1/8)，第二天看了全书的(1/10)，两天一共看了45页．这本书一共有多少页？(用方程解)
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">45 / (9/40)</gadget>
<output>200</output>

<result>200</result>