PSLE
School camp shirts were available in 4 colours: brown, green, silver and pink. At the camp, each contestants chose one shirt. The pie chart represents the contestants' choice of shirt colours. 36 contestants chose green shirts. The contestants' choice of shirt colours is also represented by the bar graph. The bar that shows the number of contestants who chose silver shirts has not been drawn. How many contestants chose silver shirts?

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

From the bar graph,
Number of contestants who chose brown = Number of contestants who chose pink = 45 

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

Total number of contestants = 180

Number of contestants who chose silver shirts
= 180 - 45 - 45 - 36
= 54

Answer(s): 54