Probably the easiest way is to simply run a SQL query like this, using the native MySQL functions.
SELECT COUNT(*) FROM qa_posts WHERE type='Q'
Alternatively, you can access Q2A outside of Q2A using the code here. You should be able to run a query using the function qa_db_query_raw.
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If you have a question about Q2A, please ask here, in English.
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April 20, 2021: Q2A 1.8.6 released!