There is a barrel of oil, all (2/5) of which has been used up, and there are 48 kilograms left in the barrel. How many kilograms does this barrel of oil weigh?
有一桶油，已经用去了全部的(2/5)，桶里还剩48千克，这桶油重多少千克？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">48 / (2/5)</gadget>
<output>120</output>

<result>120</result>