The grades of 36 students in a test are shown in the pie chart above. How many students had excellent?
Attached Figure / Diagram
A
7
B
8
C
9
D
12
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
Angle of Excellence
= 360 - (120+80+90)
= 360 - 290
= 70o
If 360o represents 36 students
1º will represent \(\frac{36}{360}\)
50^\circ will represent \(\frac{36}{360}\) * \(\frac{70}{1}\)
= 7
Source: Myschool Past Questions Archive (Record #8535)