The tractor plowed (1/3) on the first day, and 2 hectares on the second day, leaving (1/6) unplowed. How many hectares are there in total?
拖拉机第一天耕了(1/3)，第二天耕了2公顷，还剩(1/6)没耕，求一共有多少公顷？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 - (1/3) - (1/6)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / (1/2)</gadget>
<output>4</output>

<result>4</result>