barrel of oil weighs 16.5 kilograms. After pouring out (1/3) of the oil, the weight of the barrels is 11.5 kilograms. How many kilograms does the oil barrel weigh?
一桶油连桶共重16.5千克，倒出油的(1/3)后，连桶共重11.5千克，油桶重多少千克？
<gadget id="calculator">16.5 - 11.5</gadget>
<output>5</output>

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

<gadget id="calculator">5 / (1/3)</gadget>
<output>15</output>

<gadget id="calculator">16.5 - 15</gadget>
<output>1.5</output>

<result>1.5</result>