PSLE
School camp windbreakers were available in 4 colours: red, black, green and white. At the camp, each pupils chose one windbreaker. The pie chart represents the pupils' choice of windbreaker colours. 44 pupils chose black windbreakers. The pupils' choice of windbreaker colours is also represented by the bar graph. The bar that shows the number of pupils who chose green windbreakers has not been drawn. How many pupils chose green windbreakers?

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

From the bar graph,
Number of pupils who chose red = Number of pupils who chose white = 55 

¹₄ of the pie chart = 55
⁴₄ of the pie chart = 4 x 55 = 220

Total number of pupils = 220

Number of pupils who chose green windbreakers
= 220 - 55 - 55 - 44
= 66

Answer(s): 66