There are 84 cars parked in the parking lot. In the morning, 30 cars drove away, and 8 cars came in. How many cars are there in the parking lot at this time?
停车场上停有84辆车．早晨开走了30辆，又开进来了8辆，这时停车场上还有多少辆车？
<gadget id="calculator">84 - 30</gadget>
<output>54</output>

<gadget id="calculator">54 + 8</gadget>
<output>62</output>

<result>62</result>