PSLE
School camp shirts were available in 4 colours: green, blue, yellow and gold. At the camp, each students chose one shirt. The pie chart represents the students' choice of shirt colours. 43 students chose gold shirts. The students' choice of shirt colours is also represented by the bar graph. The bar that shows the number of students who chose green shirts has not been drawn. How many students chose green shirts?

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

From the bar graph,
Number of students who chose yellow = Number of students who chose blue = 43 

¹₄ of the pie chart = 43
⁴₄ of the pie chart = 4 x 43 = 172

Total number of students = 172

Number of students who chose green shirts
= 172 - 43 - 43 - 43
= 43

Answer(s): 43