A bucket of water, pour out (1/3) for the first time, pour out 5 liters for the second time, pour out the rest (1/9) for the third time, and pour 4 liters for the fourth time, then there is 12 liters of water, how many liters of water are there in the bucket?
一桶水，第一次倒出(1/3)，第二次倒出5升，第三次倒出剩下的(1/9)，第四次倒入4升，这时桶中有水12升，原来桶中有水多少升？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">5 * (1/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">12 - (5/9) - 4</gadget>
<output>67/9 = around 7.444444</output>

<gadget id="calculator">5 + (67/9)</gadget>
<output>112/9 = around 12.444444</output>

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

<gadget id="calculator">(1/3) * (1/9)</gadget>
<output>1/27 = around 0.037037</output>

<gadget id="calculator">(1/27) - (1/9) - (1/3)</gadget>
<output>-11/27 = around -0.407407</output>

<gadget id="calculator">1 + (-11/27)</gadget>
<output>16/27 = around 0.592593</output>

<gadget id="calculator">(112/9) / (16/27)</gadget>
<output>21</output>

<result>21</result>