CREATE TABLE table_4147 ("Couple" TEXT, "Week 1" FLOAT, "Week 2" FLOAT, "Week 3" FLOAT, "Week 4" TEXT, "Week 5" TEXT, "Week 6" TEXT, "Week 7" TEXT, "Week 8 Final" TEXT)

How many week 2 scores have a week 7 score of 40 + 40 = 80?
SELECT COUNT("Week 2") FROM table_4147 WHERE "Week 7" = '40 + 40 = 80'
SELECT COUNT("Week 2") FROM "table_4147" WHERE "Week 7" = '40 + 40 = 80'