Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Home team | Home team score | Away team | Away team score | Venue | Crowd | Date |
| --- | --- | --- | --- | --- | --- | --- |
| Hawthorn | 15.12 (102) | Richmond | 17.11 (113) | Glenferrie Oval | 18103.0 | 12 August 1972 |
| Geelong | 11.19 (85) | Melbourne | 21.16 (142) | Kardinia Park | 12716.0 | 12 August 1972 |
| Fitzroy | 14.14 (98) | South Melbourne | 6.17 (53) | Junction Oval | 7451.0 | 12 August 1972 |
| Essendon | 21.14 (140) | North Melbourne | 14.11 (95) | Windy Hill | 14454.0 | 12 August 1972 |
| Carlton | 13.16 (94) | St Kilda | 10.11 (71) | Princes Park | 22109.0 | 12 August 1972 |
| Collingwood | 15.12 (102) | Footscray | 7.13 (55) | VFL Park | 21540.0 | 12 August 1972 |
Question:
What is the average crowd size when the away team scores 7.13 (55)?
Answer:
21540.0