There is a story book, Mao Daya read the whole book (1/7) on the first day, and the rest (1/6) on the second day, if the total number of pages in the book is 140 pages, on the third day Mao Daya From which page should I read?
有本故事书，毛达鸭第一天读了全书的(1/7)，第二天读了余下的(1/6)，如果书的总页数为140页，第三天毛达鸭应从第几页读起呢？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">140 * (1/7)</gadget>
<output>20</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">140 * (6/7) * (1/6)</gadget>
<output>20</output>

<gadget id="calculator">20 + 20 + 1</gadget>
<output>41</output>

<result>41</result>