PSLE
School camp vests were available in 4 colours: white, red, purple and silver. At the camp, each students chose one vest. The pie chart represents the students' choice of vest colours. 32 students chose silver vests. The students' choice of vest colours is also represented by the bar graph. The bar that shows the number of students who chose white vests has not been drawn. How many students chose white vests?

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

From the bar graph,
Number of students who chose purple = Number of students who chose red = 48 

¹₄ of the pie chart = 48
⁴₄ of the pie chart = 4 x 48 = 192

Total number of students = 192

Number of students who chose white vests
= 192 - 48 - 48 - 32
= 64

Answer(s): 64