barrel of oil weighs 10.8 kilograms. The barrel of oil (1/4) was used for the first time, the remaining (1/3) was used for the second time, and the remaining (1/3) after the first two uses were used for the third time. (1/2), how many kilograms of oil are left in the barrel?
一桶油重10.8千克，第一次用去了这桶油的(1/4)，第二次用去了余下的(1/3)，第三次用去了前两次用后余下的(1/2)，桶中还剩下多少千克油？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">10.8 * (1/4)</gadget>
<output>2.7</output>

<gadget id="calculator">10.8 - 2.7</gadget>
<output>8.1</output>

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

<gadget id="calculator">8.1 * (1/3)</gadget>
<output>2.7</output>

<gadget id="calculator">10.8 - 2.7 - 2.7</gadget>
<output>5.4</output>

<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">5.4 * (1/2)</gadget>
<output>2.7</output>

<result>2.7</result>