PSLE
School camp vests were available in 4 colours: red, yellow, silver and brown. At the camp, each kids chose one vest. The pie chart represents the kids' choice of vest colours. 38 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 red vests has not been drawn. How many kids chose red vests?

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

From the bar graph,
Number of kids who chose silver = Number of kids who chose yellow = 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 red vests
= 240 - 60 - 60 - 38
= 82

Answer(s): 82