There are 36 kilograms in a barrel of oil, the first time is taken out (2/9), and the second time is less than the first time (1/4), how many kilograms are left in the barrel?
一桶油有36千克，第一次取出(2/9)，第二次比第一次少取出(1/4)，桶里还剩多少千克？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/9) * (3/4)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (2/9) - (1/6)</gadget>
<output>11/18 = around 0.611111</output>

<gadget id="calculator">36 * (11/18)</gadget>
<output>22</output>

<result>22</result>