CREATE TABLE table_21977 ("Rank by average" FLOAT, "Place" FLOAT, "Couple" TEXT, "Total points" FLOAT, "Number of dances" FLOAT, "Average" TEXT)

How many dances did Warren & Kym have?
SELECT "Number of dances" FROM table_21977 WHERE "Couple" = 'Warren & Kym'
SELECT "Number of dances" FROM "table_21977" WHERE "Couple" = 'Warren & Kym'