A book has 72 pages. Xiao Ming reads (1/8) of it on the first day, the rest (1/7) on the second day, and the rest (1/6) on the third day. What page do you look at?
一本书72页，小明第一天看了它的(1/8)，第二天看了余下的(1/7)，第三天看了余下的(1/6)，第四天从第几页看起？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(7/8) * (1/7)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8) - (1/8)</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) * (1/6)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) + (1/8) + (1/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">72 * (3/8)</gadget>
<output>27</output>

<gadget id="calculator">27 + 1</gadget>
<output>28</output>

<result>28</result>