Last year, there were 120 members in a school concert club. The number of girls was
35 the number of boys.
- What percentage of the members were girls last year?
- This year, 10 boys left the club and 15 girls joined the club. What percentage of the members are girls this year?
(a)
Girls : Boys : Total
3 : 5 : 8
Percentage of members that were girls
=
38 x 100%
= 37.5%
(b)
|
Girls |
Boys |
Before |
3 u |
5 u |
Change |
+ 15 |
- 10 |
After |
3 u + 15 |
5 u - 10 |
8 u = 120
1 u = 120 ÷ 8 = 15
Number of girls this year
= 3 u + 15
= (3 x 15) + 15
= 45 + 15
= 60
Total members this year
= 120 + 15 - 10
= 125
Percentage of girls in the club
=
60125 x 100%
= 48%
Answer(s): (a) 37.5%; (b) 48%