CREATE TABLE table_23159 ("Institution" TEXT, "Nickname" TEXT, "Location" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" FLOAT, "Joined" FLOAT, "Left" FLOAT, "Current Conference" TEXT)

When was the school in Philadelphia, Pennsylvania founded?
SELECT "Founded" FROM table_23159 WHERE "Location" = 'Philadelphia, Pennsylvania'
SELECT "Founded" FROM "table_23159" WHERE "Location" = 'Philadelphia, Pennsylvania'