The vegetable base in the suburbs transported a batch of vegetables to the city. The original plan was to load 1,200 kilograms per vehicle, but the actual load was 1,680 kilograms per vehicle. As a result, two vehicles were used less. How many cars did you plan to use?
郊区蔬菜基地向城里运一批蔬菜，原计划每辆车装1200千克，实际每辆车装1680千克，结果少用了2辆车．原计划用车多少辆？
<gadget id="calculator">1_680 * 2</gadget>
<output>3_360</output>

<gadget id="calculator">1_680 - 1_200</gadget>
<output>480</output>

<gadget id="calculator">3_360 / 480</gadget>
<output>7</output>

<result>7</result>