A bucket of milk, pour out its (1/3), and then pour out 2 liters and half of the bucket of milk, how many liters of this bucket of milk are there?
一桶牛奶，倒出去它的(1/3)，再倒出2升还剩半桶牛奶，这桶牛奶共有多少升？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / (1/6)</gadget>
<output>12</output>

<result>12</result>