428 students from Hongri Primary School went to the Science and Culture Museum. 68 people have already gone, and every 30 people take a minibus, how many cars are needed?
红日小学的428名同学去参加科文馆．已经去了68人，剩下的每30人乘一辆中巴车，需要多少辆车？
<gadget id="calculator">428 - 68</gadget>
<output>360</output>

<gadget id="calculator">360 / 30</gadget>
<output>12</output>

<result>12</result>