CREATE TABLE table_24824 ("Episode number" FLOAT, "Title" TEXT, "Original airing" TEXT, "Timeslot" TEXT, "Viewers" FLOAT, "Top 50 Ranking" FLOAT, "Scripted Show Ranking" FLOAT)

How many of the episodes in the top 50 rankings were originally aired on June 28, 2010?
SELECT COUNT("Top 50 Ranking") FROM table_24824 WHERE "Original airing" = 'June 28, 2010'
SELECT COUNT("Top 50 Ranking") FROM "table_24824" WHERE "Original airing" = 'June 28, 2010'