A barrel of oil weighs 25 kilograms. After pouring out (2/3) of the oil, the rest of the barrel weighs 9 kilograms. How many kilograms does this barrel of oil weigh?
一桶油连桶重25千克，倒出油的(2/3)，剩下的连桶共重9千克，这桶油重多少千克．
<gadget id="calculator">25 - 9</gadget>
<output>16</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">16 / (2/3)</gadget>
<output>24</output>

<result>24</result>