A barrel of oil weighs 126 kilograms, half of which is 71 kilograms. If the price per kilogram is 6 yuan, how much can the barrel of oil be sold for?
一桶油连桶带油共重126千克，售出一半后的重量为71千克，如果每千克售价6元，这桶油共可卖多少元？
<gadget id="calculator">126 - 71</gadget>
<output>55</output>

<gadget id="calculator">55 * 2 * 6</gadget>
<output>660</output>

<result>660</result>