The tractor plowed a piece of land on the first day (1/4), and the second day plowed more (1/12) than on the first day, what percentage of the land is left unplowed?
拖拉机第一天耕一块地的(1/4)，第二天比第一天多耕这块地的(1/12)，还剩下这块地的几分之几没有耕？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/4) + (1/12) + (1/4)</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>