How many top tens had an average start of 29.4?
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
)
SELECT COUNT("Top 10") FROM table_15946 WHERE "Avg. Start" = '29.4'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many top tens had an average start of 29.4? ### Input: 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
) ### Response: SELECT COUNT("Top 10") FROM table_15946 WHERE "Avg. Start" = '29.4'