PSLE
School camp skirts were available in 4 colours: gold, pink, green and purple. At the camp, each students chose one skirt. The pie chart represents the students' choice of skirt colours. 38 students chose pink skirts. The students' choice of skirt colours is also represented by the bar graph. The bar that shows the number of students who chose green skirts has not been drawn. How many students chose green skirts?

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

From the bar graph,
Number of students who chose gold = Number of students who chose purple = 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 green skirts
= 240 - 60 - 60 - 38
= 82

Answer(s): 82