PSLE
School camp skirts were available in 4 colours: grey, purple, yellow and white. At the camp, each pupils chose one skirt. The pie chart represents the pupils' choice of skirt colours. 44 pupils chose grey skirts. The pupils' choice of skirt colours is also represented by the bar graph. The bar that shows the number of pupils who chose purple skirts has not been drawn. How many pupils chose purple skirts?

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

From the bar graph,
Number of pupils who chose yellow = Number of pupils who chose white = 45 

¹₄ of the pie chart = 45
⁴₄ of the pie chart = 4 x 45 = 180

Total number of pupils = 180

Number of pupils who chose purple skirts
= 180 - 45 - 45 - 44
= 46

Answer(s): 46