** 1) If 250 students took the exam, how many students get D grade?**

(A) 35

(B) 25

(C) 10

(D) 29

** 2) If 500 students give the exam, how many students get C grade?**

(A) 50

(B) 20

(C) 35

(D) 10

** 3) What percent of the students who failed the exam would have had to pass it, in order for percent of students passing the exam to be at least 77% out of 500?**

(A) 15%

(B) 21%

(C) 23%

(D) 27%