The quality of the first barrel of oil is 6 times that of the second barrel of oil. Take 12 kilograms of oil from the first barrel and pour it into the second barrel. At this time, the quality of the first barrel of oil is 4 times that of the second barrel of oil. How many kilograms did it have?
第一桶油的质量是第二桶油的6倍，从第一桶取12千克油倒入第二桶，这时第一桶油的质量是第二桶油的4倍，第一桶油原来有多少千克？
<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">12 + 48</gadget>
<output>60</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 * 6</gadget>
<output>180</output>

<result>180</result>