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

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

From the bar graph,
Number of kids who chose brown = Number of kids who chose white = 45 

¹₄ of the pie chart = 45
⁴₄ of the pie chart = 4 x 45 = 180

Total number of kids = 180

Number of kids who chose gold blazers
= 180 - 45 - 45 - 45
= 45

Answer(s): 45