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_204_711 ( id number, "dance" text, "best dancer(s)" text, "best score" number, "worst dancer(s)" text, "worst score" number )

### Question ###
how many dancers achieved a best score of at least 40 ?

### Accurate SQL ###

SELECT COUNT("best dancer(s)") FROM table_204_711 WHERE "best score" >= 40