user: Question: How many have the Till Agra of 500?
Columns: ['Vehicle Category', 'Till Aligarh', 'Till Mathura', 'Till Agra', 'For Round Trip']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Two wheeler', 50.0, 100.0, 150.0, 280.0]
SQL:

assistant: SELECT COUNT("Till Mathura") FROM "Table" WHERE "Till Agra" = 500.0;