A barrel of oil weighs 20 kilograms, poured out (4/5), and is packed in 3 bottles on average. How many kilograms of oil are contained in each bottle?
一桶油重20千克，倒出(4/5)，平均装在3个瓶子里，每个瓶装多少千克油？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 3</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">20 * (4/15)</gadget>
<output>16/3 = around 5.333333</output>

<result>16/3 = around 5.333333</result>