There are three barrels of oil, A, B, and C. A barrel is 6 (3/5) kilograms, and B barrel is 5 (4/5) kilograms. The weight difference between the two barrels of A and B is equivalent to that of barrel C (2/15) , How many kilograms does a barrel of C oil weigh?
有甲、乙、丙三桶油，甲桶6(3/5)千克，乙桶5(4/5)千克，甲、乙两桶油重量的相差数相当于丙桶的(2/15)，丙桶油重多少千克？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(4/5) / (2/15)</gadget>
<output>6</output>

<result>6</result>