There are 14 cars and two-wheeled motorcycles parked in the parking lot. There are 40 wheels in total. How many cars are there?
停车场停了小轿车和两轮摩托共14辆，共有40个轮子，轿车多少辆．
<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">40 - 28</gadget>
<output>12</output>

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

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>