PSLE
School camp t-shirts were available in 4 colours: blue, white, green and pink. At the camp, each kids chose one t-shirt. The pie chart represents the kids' choice of t-shirt colours. 40 kids chose blue t-shirts. The kids' choice of t-shirt colours is also represented by the bar graph. The bar that shows the number of kids who chose white t-shirts has not been drawn. How many kids chose white t-shirts?

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

From the bar graph,
Number of kids who chose green = Number of kids who chose pink = 60 

¹₄ of the pie chart = 60
⁴₄ of the pie chart = 4 x 60 = 240

Total number of kids = 240

Number of kids who chose white t-shirts
= 240 - 60 - 60 - 40
= 80

Answer(s): 80