The ratio of what is eaten to what is left in a barrel of oil is 3:4, and another 66 kilograms are eaten. At this time, the ratio of what is eaten to what is left is 5:3. How many kilograms of this barrel of oil are there in total?
一桶油吃掉的和剩下的比是3：4，又吃了66千克，这时吃掉和剩下的比是5：3，这桶油一共多少千克．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(5/8) - (3/7)</gadget>
<output>11/56 = around 0.196429</output>

<gadget id="calculator">66 / (11/56)</gadget>
<output>336</output>

<result>336</result>