PSLE
School camp shirts were available in 4 colours: blue, black, white and gold. At the camp, each kids chose one shirt. The pie chart represents the kids' choice of shirt colours. 33 kids chose black shirts. The kids' choice of shirt colours is also represented by the bar graph. The bar that shows the number of kids who chose white shirts has not been drawn. How many kids chose white shirts?

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

From the bar graph,
Number of kids who chose blue = Number of kids who chose gold = 45 

¹₄ of the pie chart = 45
⁴₄ of the pie chart = 4 x 45 = 180

Total number of kids = 180

Number of kids who chose white shirts
= 180 - 45 - 45 - 33
= 57

Answer(s): 57