PSLE
School camp coats were available in 4 colours: gold, purple, grey and red. At the camp, each pupils chose one coat. The pie chart represents the pupils' choice of coat colours. 44 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 purple coats has not been drawn. How many pupils chose purple coats?

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

From the bar graph,
Number of pupils who chose grey = Number of pupils who chose red = 55 

¹₄ of the pie chart = 55
⁴₄ of the pie chart = 4 x 55 = 220

Total number of pupils = 220

Number of pupils who chose purple coats
= 220 - 55 - 55 - 44
= 66

Answer(s): 66