PSLE
School camp blazers were available in 4 colours: brown, purple, silver and gold. At the camp, each students chose one blazer. The pie chart represents the students' choice of blazer colours. 42 students chose purple blazers. The students' choice of blazer colours is also represented by the bar graph. The bar that shows the number of students who chose silver blazers has not been drawn. How many students chose silver blazers?

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

From the bar graph,
Number of students who chose brown = Number of students who chose gold = 60 

¹₄ of the pie chart = 60
⁴₄ of the pie chart = 4 x 60 = 240

Total number of students = 240

Number of students who chose silver blazers
= 240 - 60 - 60 - 42
= 78

Answer(s): 78