A tourist group rents a car to go out, and the car rental fee is borne by the passengers on average. As a result, the number of passengers is exactly equal to the amount of the fare payable by each person. Later, 10 more people were added, so that the fare payable by each person was reduced by 6 yuan compared with the original one. How much is the rental fee for this car.
某旅游团租一辆车外出，租车费由乘车人平均负担，结果乘车人数与每人应付车费的元数恰好相等．后来又增加了10个人，这样每人应付车费比原来减少了6元．这辆车的租车费是多少元．
<gadget id="calculator">10 * 6</gadget>
<output>60</output>

<gadget id="calculator">10 - 1 - 6</gadget>
<output>3</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<result>225</result>