A total of 32 cars and bicycles are parked in the parking lot. These cars have 108 wheels in total. How many cars are there?
停车场停了小轿车和自行车一共32辆，这些车共有108个轮子，小轿车有多少辆．
<gadget id="calculator">32 * 4</gadget>
<output>128</output>

<gadget id="calculator">128 - 108</gadget>
<output>20</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">32 - 10</gadget>
<output>22</output>

<result>22</result>