A, B, and C buy a car together. When buying the car, A pays 1/4 of the total amount paid by B and C, and B pays the amount paid by A and C. (1/4) of the total, if A and B each pay another 30,000 yuan, then C pays 4,000 yuan less than B. How much does this car cost?
甲、乙、丙三人共买一辆汽车，买车时，甲付的钱是乙丙两人付的钱的总数的(1/4)，乙付的钱是甲丙两人付的钱总数的(1/4)，假如甲乙再各付三万元，那么丙比乙少付4000元，问问这辆车需要多少钱？
<gadget id="calculator">3 + 3 + 2.6</gadget>
<output>8.6</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5) - (1/5) - (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">8.6 / (2/5)</gadget>
<output>21.5</output>

<result>21.5</result>