The number of students in the biology hall is twice the number of students in the general hall, meaning there are 2*30 = <<2*30=60>>60 students in the biology hall.
The total number of students in the biology hall and general study hall is 60+30 = <<60+30=90>>90 students.
If there are 3/5 times as many students in the maths hall as there are in the general study hall and biology hall, their number is 3/5*90=<<3/5*90=54>>54 students in the maths hall.
The total number of students in the three halls is 54+90 = <<54+90=144>>144 students
#### 144