PSLE
School camp windbreakers were available in 4 colours: silver, red, pink and white. At the camp, each contestants chose one windbreaker. The pie chart represents the contestants' choice of windbreaker colours. 40 contestants chose red windbreakers. The contestants' choice of windbreaker colours is also represented by the bar graph. The bar that shows the number of contestants who chose pink windbreakers has not been drawn. How many contestants chose pink windbreakers?

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

From the bar graph,
Number of contestants who chose silver = Number of contestants who chose white = 40 

¹₄ of the pie chart = 40
⁴₄ of the pie chart = 4 x 40 = 160

Total number of contestants = 160

Number of contestants who chose pink windbreakers
= 160 - 40 - 40 - 40
= 40

Answer(s): 40