Wang Bin reads a book. He reads (1/4) of the whole book on the first day, and (1/6) of the whole book on the second day. What percentage of the whole book is left?
王彬看一本书，第一天看了全书的(1/4)，第二天看了全书的(1/6)，还剩下全书的几分之几没有看？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) + (1/6)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12)</gadget>
<output>7/12 = around 0.583333</output>

<result>7/12 = around 0.583333</result>