user: Question: How many placed 4th on April 25?
Columns: ['Round', 'Date', 'City and venue', 'Winner', 'Runner-up', '3rd placed', '4th placed', 'Results']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'April 25', 'Prague , Czech Republic Markéta Stadium', 'Emil Sayfutdinov', 'Fredrik Lindgren', 'Jason Crump', 'Leigh Adams', 'results']
SQL:

assistant: SELECT COUNT("4th placed") FROM "Table" WHERE "Date" = 'April 25';