There are 3 tricycles and cars, and there are 10 wheels in total. How many cars are there?
三轮车和小轿车共有3辆，一共有10个轮子，小轿车有多少辆．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">10 - 9</gadget>
<output>1</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">1 / 1</gadget>
<output>1</output>

<result>1</result>