There is a barrel of oil, 20% is used for the first time, (2/5) kg is used for the second time, and 3.6 kg is used for the two times. How many kilograms does this barrel of oil weigh?
有一桶油，第一次用去20%，第二次又用去(2/5)千克，两次一共用去3.6千克．这桶油重多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3.6 - (2/5)</gadget>
<output>3.2</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3.2 / (1/5)</gadget>
<output>16</output>

<result>16</result>