A batch of timber is delivered, (1/4) of the total is delivered on the first day, and (1/3) of the total is delivered on the second day. What percentage of the total amount is left unfinished?
运送一批木材，第一天运送了总数的(1/4)，第二天运送了总数的(1/3)．还剩总数的几分之几没有运完？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/4) + (1/3)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">1 - (7/12)</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>