PSLE
School camp sweaters were available in 4 colours: purple, red, white and green. At the camp, each participants chose one sweater. The pie chart represents the participants' choice of sweater colours. 35 participants chose green sweaters. The participants' choice of sweater colours is also represented by the bar graph. The bar that shows the number of participants who chose purple sweaters has not been drawn. How many participants chose purple sweaters?

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

From the bar graph,
Number of participants who chose white = Number of participants who chose red = 42 

¹₄ of the pie chart = 42
⁴₄ of the pie chart = 4 x 42 = 168

Total number of participants = 168

Number of participants who chose purple sweaters
= 168 - 42 - 42 - 35
= 49

Answer(s): 49