PSLE
School camp skirts were available in 4 colours: purple, white, gold and yellow. At the camp, each contestants chose one skirt. The pie chart represents the contestants' choice of skirt colours. 34 contestants chose purple skirts. The contestants' choice of skirt colours is also represented by the bar graph. The bar that shows the number of contestants who chose white skirts has not been drawn. How many contestants chose white skirts?

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

From the bar graph,
Number of contestants who chose gold = Number of contestants who chose yellow = 51 

¹₄ of the pie chart = 51
⁴₄ of the pie chart = 4 x 51 = 204

Total number of contestants = 204

Number of contestants who chose white skirts
= 204 - 51 - 51 - 34
= 68

Answer(s): 68