Xiao Ming reads a 320-page book. He reads (1/4) of the whole book on the first day, and (1/5) of the whole book on the second day. How many pages should he start reading on the third day?
小明看一本320页的书，第一天读了整本书的(1/4)，第二天读了整本书的(1/5)，第三天应该从第多少页开始读．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">320 * (9/20)</gadget>
<output>144</output>

<gadget id="calculator">144 + 1</gadget>
<output>145</output>

<result>145</result>