A barrel of oil weighs 12 kilograms in total. After selling (3/4), the weight of the barrels is 6 kilograms. How many kilograms does this barrel of oil weigh?
一桶油连桶共重12千克，卖出(3/4)以后，连桶重6千克．这桶油重多少千克？
<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">6 / (3/4)</gadget>
<output>8</output>

<result>8</result>