user: Question: How many marks are there when tackles are 3?
Columns: ['Year', 'Team', 'Number', 'Games', 'Kicks', 'Handballs', 'Total Disposals', 'Marks', 'Tackles', 'Goals', 'Behinds', 'Goal Accuracy %', 'Brownlow Medal Votes']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'text', 'real']
Sample row: [2005.0, 'Sydney', 40.0, 5.0, 21.0, 11.0, 32.0, 10.0, 3.0, 1.0, 1.0, '50%', 0.0]
SQL:

assistant: SELECT COUNT("Marks") FROM "Table" WHERE "Tackles" = 3.0;