PSLE
School camp coats were available in 4 colours: white, green, silver and gold. At the camp, each pupils chose one coat. The pie chart represents the pupils' choice of coat colours. 40 pupils chose gold coats. The pupils' choice of coat colours is also represented by the bar graph. The bar that shows the number of pupils who chose white coats has not been drawn. How many pupils chose white coats?

    
From the pie graph,
fraction of pupils who chose silver or green
= ^90°_360°
= ¹₄

From the bar graph,
Number of pupils who chose silver = Number of pupils who chose green = 48 

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

Total number of pupils = 192

Number of pupils who chose white coats
= 192 - 48 - 48 - 40
= 56

Answer(s): 56