PSLE
School camp t-shirts were available in 4 colours: pink, black, gold and blue. At the camp, each kids chose one t-shirt. The pie chart represents the kids' choice of t-shirt colours. 38 kids chose pink 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 black t-shirts has not been drawn. How many kids chose black t-shirts?

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

From the bar graph,
Number of kids who chose gold = Number of kids who chose blue = 57 

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

Total number of kids = 228

Number of kids who chose black t-shirts
= 228 - 57 - 57 - 38
= 76

Answer(s): 76