There are 10 cars and motorcycles in the parking lot. There are 34 wheels on the two cars. How many cars are there?
停车场里有轿车和摩托车共10辆，两种车的车轮共34个，轿车有多少辆．
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">40 - 34</gadget>
<output>6</output>

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

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<result>7</result>