A barrel of oil, when 3/7 of it is used up, exactly 24 kg is used up. How much does this barrel of oil weigh in kilograms?
一桶油，用去它的(3/7)，正好用去24千克，这桶油重多少千克．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">24 / (3/7)</gadget>
<output>56</output>

<result>56</result>