For a barrel of oil, pour out the whole barrel (1/6) for the first time, and pour out 40 kilograms more than the first time for the second time. At this time, the ratio of the oil that has been poured out to the remaining oil is 7:5. How many kilograms are there in this barrel of oil?
一桶油，第一次倒出全桶的(1/6)，第二次比第一次多倒出40千克，这时已经倒出的油与剩下的油的比是7：5．这桶油共有多少千克？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(7/12) - (1/3)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 / (1/4)</gadget>
<output>160</output>

<result>160</result>