A tractor plows a piece of land. The first day plows (1/4) of this field, and the second day plows more (1/12) than the first day. What percentage is left unplowed?
拖拉机耕一块地，第一天耕了这块地的(1/4)，第二天比第一天多耕了这块地的(1/12)，还剩几分之几没有耕？
<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>