Xiao Ming reads a book. He reads (1/3) of the whole book on the first day, and 40 pages on the second day. At this time, the remaining half is not read. How many pages did he read on the first day?
小明看一本书，第一天看了全书的(1/3)，第二天看了40页，这时还剩下一半没有看，第一天看了多少页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">40 / (1/6)</gadget>
<output>240</output>

<gadget id="calculator">240 * (1/3)</gadget>
<output>80</output>

<result>80</result>