Give the step-by-step reasoning process and then the final answer. There are 30 students in the general study hall and twice as many students in the biology hall as there are in the general study hall. If the number of students in the math hall is 3/5 times as many as the combined total number of students in the general study hall and the biology hall combined, calculate the total number of students in all the halls combined.
The number of students in the biology hall is twice the number of students in the general hall, meaning there are 2 * 30 = 60 students in the biology hall. The total number of students in the biology hall and general study hall is 60 + 30 = 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 = 54 students in the maths hall. The total number of students in the three halls is 54 + 90 = 144 students.
The final answer: 144.