Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15946 ( "Year" real, "Starts" real, "Wins" real, "Top 5" real, "Top 10" real, "Poles" real, "Avg. Start" text, "Avg. Finish" text, "Winnings" text, "Position" text, "Team(s)" text )

### Question ###
How many top tens had an average start of 29.4?

### Accurate SQL ###

SELECT COUNT("Top 10") FROM table_15946 WHERE "Avg. Start" = '29.4'