PSLE
School camp coats were available in 4 colours: blue, black, purple and green. At the camp, each participants chose one coat. The pie chart represents the participants' choice of coat colours. 38 participants chose black coats. The participants' choice of coat colours is also represented by the bar graph. The bar that shows the number of participants who chose purple coats has not been drawn. How many participants chose purple coats?

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

From the bar graph,
Number of participants who chose blue = Number of participants who chose green = 57 

¹₄ of the pie chart = 57
⁴₄ of the pie chart = 4 x 57 = 228

Total number of participants = 228

Number of participants who chose purple coats
= 228 - 57 - 57 - 38
= 76

Answer(s): 76