One barrel of oil is used up (2/5), and there are 48 kilograms left. How much kilogram does this barrel of oil originally weigh?
一桶油用去(2/5)，还剩下48千克，这桶油原来重多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">48 / (3/5)</gadget>
<output>80</output>

<result>80</result>