PSLE
School camp coats were available in 4 colours: silver, blue, grey and red. At the camp, each participants chose one coat. The pie chart represents the participants' choice of coat colours. 36 participants chose blue coats. The participants' choice of coat colours is also represented by the bar graph. The bar that shows the number of participants who chose grey coats has not been drawn. How many participants chose grey coats?

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

From the bar graph,
Number of participants who chose silver = Number of participants who chose red = 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 grey coats
= 180 - 45 - 45 - 36
= 54

Answer(s): 54