Teacher Zhang led several students to participate in the "China Star of Hope Math Summer Camp", and contacted two travel agencies. The full price was 1200 yuan per person. After negotiation, agency A agreed to pay the full ticket for the teacher and 25% off for students; travel agency B agreed with the teacher and All students get a 20% discount. After calculation, Mr. Zhang found that the fees of the two travel agencies are exactly the same, so how many students did she bring to the summer camp?
张老师带领若干名同学参加"中国希望之星数学夏令营"，联系了两家旅行社，全价都是1200元/人，经协商，甲履行社同意老师全票，学生7.5折；乙旅行社同意老师和学生全部打8折，经计算，张老师发现两家旅行社的费用正好相等，那么她带了多少名学生参加夏令营．
<gadget id="calculator">1 - 0.8</gadget>
<output>0.2</output>

<gadget id="calculator">0.8 - 0.75</gadget>
<output>0.05</output>

<gadget id="calculator">0.2 / 0.05</gadget>
<output>4</output>

<result>4</result>