There are two classes in the fifth grade. The number of students in each class is between 35 and 50. The ratio of the number of boys and girls in each class is 2:1. Now all the students in the fifth grade will be divided into two parts by boys and girls to perform in a queue. Girls stand in a row of 5 people, and the remaining 2 people stand in front of the team to lead the team. The boys queue happens to stand in a row every 6 people. How many students are there in the fifth grade?
五年级共两个班，每班人数都在35人至50人之间，每班男女生人数的比都是2：1．现将五年级的全体学生按男女生分成两部分进行队列表演．女生队列每5人站一排，正好余下2人站在队伍前面领队．男生队列恰好每6人站一排．五年级一共有多少名学生．
<result>81</result>