A barrel of edible oil weighs 10 kg in total, and after half of the oil is used, the weight of the barrel is still 5.5 kg. If cooking oil is 5.9 yuan per kilogram, how much does it cost to buy a barrel of oil?
一桶食用油连桶共重10千克，用去油的一半后，连桶还重5.5千克．如果每千克食用油5.9元，买一桶油需多少元？
<gadget id="calculator">10 - 5.5</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 * 2 * 5.9</gadget>
<output>53.1</output>

<result>53.1</result>