Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Milly is figuring out how long she needs to spend studying. She knows that her math homework will take 60 minutes. Her geography homework will take half as long as her math homework, and her science homework will take time equal to the mean amount of time she spent studying math and geography. How many minutes does Milly spend studying?

### Response:
Milly’s geography homework will take 60 / 2 = <<60/2=30>>30 minutes.
The total time Milly spent on math and geography is 60 + 30 = <<60+30=90>>90 minutes.
The mean amount of time Milly spends on math and geography is 90 / 2 = <<90/2=45>>45 minutes.
So Milly’s science homework will take 45 minutes.
Thus, Milly spends 60 + 30 + 45 = <<60+30+45=135>>135 minutes studying.
#### 135