The charge for the Oriental parking lot is 4 yuan for the first 2 hours, and 3 yuan for each hour thereafter. A car paid 22 yuan for parking, how many hours did it park in total?
东方停车场的收费规定为前2小时收费4元，以后每小时收费3元．一辆小轿车付了22元停车费，一共停了几小时？
<gadget id="calculator">22 - 4</gadget>
<output>18</output>

<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<result>8</result>