The same number of students from Primary One and Second Primary School participated in the Gold Cup. The school used cars to send students to the examination room. The cars used by Primary One had 15 people in each car, and the cars used by Second Primary School had 13 people in each car. It was necessary to send one more car than the primary school. Later, each school added one person to participate in the competition, so that the two schools needed the same number of cars. Finally, it was decided that each school would add another person to participate in the competition. Xiao Duo sent a car and asked how many people from the two schools participated in the competition?
一小和二小有同样多的同学参加金杯赛，学校用汽车把学生送往考场，一小用的汽车，每车坐15人，二小用的汽车，每车坐13人，结果二小比一小要多派一辆汽车，后来每校各增加一个人参加竞赛，这样两校需要的汽车就一样多了，最后又决定每校再各增加一个人参加竞赛，二小又要比一小多派一辆汽车，问最后两校共有多少人参加竞赛？
<gadget id="calculator">6 * 15</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">180 + 4</gadget>
<output>184</output>

<result>184</result>