PSLE
School camp shirts were available in 4 colours: silver, red, gold and pink. At the camp, each participants chose one shirt. The pie chart represents the participants' choice of shirt colours. 41 participants chose red shirts. The participants' choice of shirt colours is also represented by the bar graph. The bar that shows the number of participants who chose gold shirts has not been drawn. How many participants chose gold shirts?

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

From the bar graph,
Number of participants who chose silver = Number of participants who chose pink = 45 

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

Total number of participants = 180

Number of participants who chose gold shirts
= 180 - 45 - 45 - 41
= 49

Answer(s): 49