PSLE
School camp blazers were available in 4 colours: silver, brown, black and red. At the camp, each kids chose one blazer. The pie chart represents the kids' choice of blazer colours. 45 kids chose silver blazers. The kids' choice of blazer colours is also represented by the bar graph. The bar that shows the number of kids who chose brown blazers has not been drawn. How many kids chose brown blazers?

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

From the bar graph,
Number of kids who chose black = Number of kids who chose red = 54 

¹₄ of the pie chart = 54
⁴₄ of the pie chart = 4 x 54 = 216

Total number of kids = 216

Number of kids who chose brown blazers
= 216 - 54 - 54 - 45
= 63

Answer(s): 63