A book, Lele read (1/8) on the first day, read 10 pages less than the second day, read 50 pages on the second day, and read the rest (1/5) on the third day. From which page should the four days be read?
一本书，乐乐第一天看了(1/8)，比第二天少看了10页，第二天看了50页，第三天看了剩下的(1/5)，第四天应从第几页看起？
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">40 / (1/8)</gadget>
<output>320</output>

<gadget id="calculator">320 - 40 - 50</gadget>
<output>230</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">230 * (1/5)</gadget>
<output>46</output>

<gadget id="calculator">40 + 50 + 46 + 1</gadget>
<output>137</output>

<result>137</result>