A barrel of oil, after eating 75 kilograms, exactly (2/5) of this barrel of oil is left, how many kilograms of this barrel of oil originally?
一桶油，吃了75千克后，正好剩下这桶油的(2/5)，这桶油原来有多少千克？
<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">75 / (3/5)</gadget>
<output>125</output>

<result>125</result>