JAMB 1999 · UME · Q46

The grades of 36 students in a class test are shown in the pie chart. How many students had excellent?

Worked solution (try it first)

Very good is marked with a right angle, so it is $90^\circ$ .
Excellent is the rest: $360^\circ - 120^\circ - 80^\circ - 90^\circ = 70^\circ$ .
Number of students: $\frac{70}{360} \times 36 = 7$ , option A.