PSLE
School camp vests were available in 4 colours: brown, green, blue and black. At the camp, each kids chose one vest. The pie chart represents the kids' choice of vest colours. 35 kids chose brown vests. The kids' choice of vest colours is also represented by the bar graph. The bar that shows the number of kids who chose green vests has not been drawn. How many kids chose green vests?

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

From the bar graph,
Number of kids who chose blue = Number of kids who chose black = 42 

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

Total number of kids = 168

Number of kids who chose green vests
= 168 - 42 - 42 - 35
= 49

Answer(s): 49