CREATE TABLE table_22951 ("Round" FLOAT, "Date" TEXT, "City and venue" TEXT, "Winner" TEXT, "Runner-up" TEXT, "3rd placed" TEXT, "4th placed" TEXT, "Results" TEXT)

How many placed 4th on April 25?
SELECT COUNT("4th placed") FROM table_22951 WHERE "Date" = 'April 25'
SELECT COUNT("4th placed") FROM "table_22951" WHERE "Date" = 'April 25'