A book has 200 pages. Xiaojun reads (2/5) of the whole book on the first day and (1/4) of the whole book on the second day. What page should he read from on the third day?
一本书200页，小军第一天看了全书的(2/5)，第二天看了全书的(1/4)，第三天应从第几页看起？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">200 * (2/5)</gadget>
<output>80</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">200 * (1/4)</gadget>
<output>50</output>

<gadget id="calculator">80 + 50 + 1</gadget>
<output>131</output>

<result>131</result>