PSLE
School camp windbreakers were available in 4 colours: purple, brown, white and red. At the camp, each participants chose one windbreaker. The pie chart represents the participants' choice of windbreaker colours. 37 participants chose red windbreakers. The participants' choice of windbreaker colours is also represented by the bar graph. The bar that shows the number of participants who chose purple windbreakers has not been drawn. How many participants chose purple windbreakers?

    
From the pie graph,
fraction of participants who chose white or brown
= ^90°_360°
= ¹₄

From the bar graph,
Number of participants who chose white = Number of participants who chose brown = 45 

¹₄ of the pie chart = 45
⁴₄ of the pie chart = 4 x 45 = 180

Total number of participants = 180

Number of participants who chose purple windbreakers
= 180 - 45 - 45 - 37
= 53

Answer(s): 53