CREATE TABLE table_76049 ("Round" TEXT, "Main date" TEXT, "Number of fixtures" FLOAT, "Clubs" TEXT, "New entries this round" TEXT)

What is the sum of Number of fixtures when the rounds shows quarter-finals?
SELECT SUM("Number of fixtures") FROM table_76049 WHERE "Round" = 'quarter-finals'
SELECT SUM("Number of fixtures") FROM "table_76049" WHERE "Round" = 'quarter-finals'