CREATE TABLE table_46668 ("Grade" TEXT, "Description" TEXT, "Measurement" TEXT, "Function %" TEXT, "Estimated function %" FLOAT)

What is the function percentage when the estimated function percentage is 20?
SELECT "Function %" FROM table_46668 WHERE "Estimated function %" = '20'
SELECT "Function %" FROM "table_46668" WHERE "Estimated function %" = '20'