Xiao Ding reads a 72-page story book. He reads (1/6) of the whole book on the first day and (1/8) of the whole book on the second day. How many pages are left?
小丁看一本72页的故事书，第一天看了全书的(1/6)，第二天看了全书的(1/8)，还剩下多少页没看？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">72 * (1/6)</gadget>
<output>12</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">72 * (1/8)</gadget>
<output>9</output>

<gadget id="calculator">12 + 9</gadget>
<output>21</output>

<gadget id="calculator">72 - 21</gadget>
<output>51</output>

<result>51</result>