A pot of oil, including the pot, weighs 4 kilograms. After half of the oil is used, the oil and the pot weigh 2.32 kg. How many kilograms of oil is in the pot?
一壶油，连壶共重4千克，用去一半油后，油连壶重2.32千克．壶内原有油多少千克？
<gadget id="calculator">4 - 2.32</gadget>
<output>1.68</output>

<gadget id="calculator">1.68 * 2</gadget>
<output>3.36</output>

<result>3.36</result>