A bucket of milk, use up (1/3) and 4 liters, leaving half of this bucket of milk, how many liters of this bucket of milk?
一桶牛奶，用去它的(1/3)又4升，剩下这桶牛奶的一半，这桶牛奶多少升？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (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">4 / (1/6)</gadget>
<output>24</output>

<result>24</result>