Pei Chun Public Sch 2007 PSLE Math Prelim Q39

A group of pupils were asked to choose a co-curricular activity. The pie chart represents their choices. The same number of pupils chose Basketball and Volleyball.
a) 60 pupils chose Table Tennis. How many pupils chose Basketball?
b) The ratio of the number of pupils who chose Basketball to the number of pupils who chose Soccer is 3 : 10. How many pupils chose Scouts?



Solution

a)
Table Tennis (1/4 pie chart) ----- 60
Basketball (1/2 x Table Tennis) ----- ½ x 60 = 30

Answer: 30 pupils chose Basketball.


b)
Soccer + Scouts (1/2 pie chart) ----- 60 x 2 = 120

Basketball : Soccer
3 : 10
30 : 100

If 100 chose soccer, Scouts ----- 120 – 100 = 20

Answer: 20 chose Scouts.