There are two barrels of oil, A and B, the quality of oil in barrel A is (5/2) times that of barrel B, after pouring 5 kg of oil from barrel A to barrel B, the quality of oil in barrel A is (4/2) times that of barrel B 3) Times, how many kilograms of original oil in barrel B?
有甲、乙两桶油，甲桶油的质量是乙桶的(5/2)倍，从甲桶中倒出5千克油给乙桶后，甲桶油的质量是乙桶的(4/3)倍，乙桶中原有油多少千克？
<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(5/7) - (4/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">1 + (5/2)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">5 / (1/7) / (7/2)</gadget>
<output>10</output>

<result>10</result>