The correct option is B 45
In the given pie chart, the central angle of the sector corresponding to oranges is 90∘, and it is given that 30 students like oranges.
Hence, 90∘ represents 30 students. We know that the full circle (360∘) represents the entire class.
⟹Total number of students=360∘90∘×30=120.
Note that the central angle of the sector corresponding to pineapples is 135∘.
∴Number of students who like pineapples=135∘360∘×120=45.