PSLE
School camp sweaters were available in 4 colours: black, silver, red and pink. At the camp, each contestants chose one sweater. The pie chart represents the contestants' choice of sweater colours. 44 contestants chose pink sweaters. The contestants' choice of sweater colours is also represented by the bar graph. The bar that shows the number of contestants who chose black sweaters has not been drawn. How many contestants chose black sweaters?

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

From the bar graph,
Number of contestants who chose red = Number of contestants who chose silver = 60 

¹₄ of the pie chart = 60
⁴₄ of the pie chart = 4 x 60 = 240

Total number of contestants = 240

Number of contestants who chose black sweaters
= 240 - 60 - 60 - 44
= 76

Answer(s): 76