Answer:
24 females got a grade A.
Explanation:
To find the number of females who got a grade A, we need to subtract the number of males who got a grade A from the total number of students who got a grade A.
The total number of students who got a grade A is 80 (the total number of students) minus 33 (students who got a grade C) minus 20 (males who got a grade B) minus 3 (males who got a grade A).
So, the number of females who got a grade A is 80 - 33 - 20 - 3 = 24.