CREATE TABLE table_9640 ("Morse Taper number" FLOAT, "Taper" TEXT, "B  ( max ) " FLOAT, "C  ( max ) " FLOAT, "D  ( max ) " FLOAT)

What total D (max) has a taper of 1:20.047, and a C (max) bigger than 65.5?
SELECT SUM("D (max)") FROM table_9640 WHERE "Taper" = '1:20.047' AND "C (max)" > '65.5'
SELECT SUM("D (max)") FROM "table_9640" WHERE "C (max)" > '65.5' AND "Taper" = '1:20.047'