A barrel of oil weighs 8 kg, what is the weight of (2/5) barrel of oil in kg?
一桶油重8千克，(2/5)桶油重多少千克．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">8 * (2/5)</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>