A barrel of oil weighs 32 kilograms after 30% is used, and 24 kilograms after 50% is used. Do you know how many kilograms of oil are in the barrel?
一桶油，如果用去30%后连桶重32千克，如果用去50%后连桶重24千克，你知道桶中油有多少千克吗？
<gadget id="calculator">32 - 24</gadget>
<output>8</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 / (1/5)</gadget>
<output>40</output>

<result>40</result>