PSLE
School camp windbreakers were available in 4 colours: brown, purple, pink and grey. At the camp, each pupils chose one windbreaker. The pie chart represents the pupils' choice of windbreaker colours. 37 pupils chose grey windbreakers. The pupils' choice of windbreaker colours is also represented by the bar graph. The bar that shows the number of pupils who chose brown windbreakers has not been drawn. How many pupils chose brown windbreakers?

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

From the bar graph,
Number of pupils who chose pink = Number of pupils who chose purple = 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 brown windbreakers
= 180 - 45 - 45 - 37
= 53

Answer(s): 53