PSLE
School camp windbreakers were available in 4 colours: pink, green, purple and white. At the camp, each students chose one windbreaker. The pie chart represents the students' choice of windbreaker colours. 30 students chose white windbreakers. The students' choice of windbreaker colours is also represented by the bar graph. The bar that shows the number of students who chose pink windbreakers has not been drawn. How many students chose pink windbreakers?

    
From the pie graph,
fraction of students who chose purple or green
= ^90°_360°
= ¹₄

From the bar graph,
Number of students who chose purple = Number of students who chose green = 60 

¹₄ of the pie chart = 60
⁴₄ of the pie chart = 4 x 60 = 240

Total number of students = 240

Number of students who chose pink windbreakers
= 240 - 60 - 60 - 30
= 90

Answer(s): 90