(2/5) of a barrel of oil is 40 kilograms, what is the weight of this barrel of oil in kilograms?
一桶油的(2/5)是40千克，这桶油重是多少千克．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 / (2/5)</gadget>
<output>100</output>

<result>100</result>