There are 6 cars in the parking lot, and there are 3 times as many big cars as small cars. How many large and small cars are there altogether?
停车场有小汽车6辆，大汽车是小汽车的3倍．大汽车和小汽车共多少辆？
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 + 6</gadget>
<output>24</output>

<result>24</result>