PSLE
School camp sweaters were available in 4 colours: gold, brown, green and blue. At the camp, each pupils chose one sweater. The pie chart represents the pupils' choice of sweater colours. 32 pupils chose blue sweaters. The pupils' choice of sweater colours is also represented by the bar graph. The bar that shows the number of pupils who chose gold sweaters has not been drawn. How many pupils chose gold sweaters?

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

From the bar graph,
Number of pupils who chose green = Number of pupils who chose brown = 40 

¹₄ of the pie chart = 40
⁴₄ of the pie chart = 4 x 40 = 160

Total number of pupils = 160

Number of pupils who chose gold sweaters
= 160 - 40 - 40 - 32
= 48

Answer(s): 48