PSLE
School camp skirts were available in 4 colours: yellow, gold, silver and black. At the camp, each kids chose one skirt. The pie chart represents the kids' choice of skirt colours. 30 kids chose gold skirts. The kids' choice of skirt colours is also represented by the bar graph. The bar that shows the number of kids who chose silver skirts has not been drawn. How many kids chose silver skirts?

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

From the bar graph,
Number of kids who chose yellow = Number of kids who chose black = 50 

¹₄ of the pie chart = 50
⁴₄ of the pie chart = 4 x 50 = 200

Total number of kids = 200

Number of kids who chose silver skirts
= 200 - 50 - 50 - 30
= 70

Answer(s): 70