Xiaojun reads a book with 420 pages. On the first day, he reads 40 pages. On the second day, he reads (1/7) of the whole book. On the third day, which page should he read?
小军看一本书共有420页，第一天他看了40页，第二天他看了全书的(1/7)，第三天他应该从第几页看起？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">420 * (1/7)</gadget>
<output>60</output>

<gadget id="calculator">40 + 60 + 1</gadget>
<output>101</output>

<result>101</result>