PSLE
School camp jackets were available in 4 colours: blue, red, grey and brown. At the camp, each participants chose one jacket. The pie chart represents the participants' choice of jacket colours. 32 participants chose red jackets. The participants' choice of jacket colours is also represented by the bar graph. The bar that shows the number of participants who chose grey jackets has not been drawn. How many participants chose grey jackets?

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

From the bar graph,
Number of participants who chose blue = Number of participants who chose brown = 40 

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

Total number of participants = 160

Number of participants who chose grey jackets
= 160 - 40 - 40 - 32
= 48

Answer(s): 48