CREATE TABLE table_49598 ("Scorer" TEXT, "Club" TEXT, "League goals" TEXT, "FA Cup goals" FLOAT, "League Cup goals" TEXT, "Total" FLOAT)

How many League Cup goals correspond to 3 FA Cup Goals and a total over 15 for Chesterfield?
SELECT "League Cup goals" FROM table_49598 WHERE "Total" > '15' AND "FA Cup goals" = '3' AND "Club" = 'chesterfield'
SELECT "League Cup goals" FROM "table_49598" WHERE "Club" = 'chesterfield' AND "FA Cup goals" = '3' AND "Total" > '15'