The school teacher planned to rent a bus for an outing. Because of school affairs, six of them could not go on the outing. Therefore, the fare for each person was 5 yuan more. Later, another person joined, so each person paid 4 yuan more than before. How much does it cost to rent this car?
学校教师计划租一辆客车郊游，因学校有事，有6人不能郊游，因此，每人车费要多出5元；后来又有一人参加，这样每人就比原来多出4元．这辆车的租车费是多少？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(5/4) - (6/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / (1/20)</gadget>
<output>20</output>

<gadget id="calculator">20 * (6/5)</gadget>
<output>24</output>

<gadget id="calculator">24 + 6</gadget>
<output>30</output>

<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<result>600</result>