312 students are divided into 4 cars to visit the park, the first 3 cars each take 80 students, how many students should the fourth car take?
312个同学分4辆车去公园参观，前3辆车各坐80个同学，第四辆车要坐多少个同学？
<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<gadget id="calculator">312 - 240</gadget>
<output>72</output>

<result>72</result>