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

### Instruction:
The three angles of a triangle add up to 180 degrees.  The largest angle is 5 times bigger than the smallest. The middle angle is 3 times bigger than the smallest. How many degrees is the smallest angle?

### Response:
Let x be the smallest angle.
The combination of the three is x + 3x + 5x = 9x.
Thus 9x=180.
Therefore x=<<20=20>>20.
#### 20