Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many rankings were there for the season with a finale on August 20, 2011?

### Inputs:
table_name: table, columns: ['Season', 'Episodes', 'Timeslot (ET)', 'Season Premiere', 'Season Finale', 'TV Season', 'Rank', 'Viewers (in millions)']

### Response:
SELECT COUNT Rank FROM table WHERE Season Finale = August 20, 2011