PSLE
School camp windbreakers were available in 4 colours: red, purple, gold and brown. At the camp, each students chose one windbreaker. The pie chart represents the students' choice of windbreaker colours. 30 students chose purple windbreakers. The students' choice of windbreaker colours is also represented by the bar graph. The bar that shows the number of students who chose gold windbreakers has not been drawn. How many students chose gold windbreakers?

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

From the bar graph,
Number of students who chose red = Number of students who chose brown = 54 

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

Total number of students = 216

Number of students who chose gold windbreakers
= 216 - 54 - 54 - 30
= 78

Answer(s): 78