Last year, there were 152 members in a school roadshow club. The number of girls was
35 the number of boys.
- What percentage of the members were girls last year?
- This year, 7 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 |
- 7 |
After |
3 u + 15 |
5 u - 7 |
8 u = 152
1 u = 152 ÷ 8 = 19
Number of girls this year
= 3 u + 15
= (3 x 19) + 15
= 57 + 15
= 72
Total members this year
= 152 + 15 - 7
= 160
Percentage of girls in the club
=
72160 x 100%
= 45%
Answer(s): (a) 37.5%; (b) 45%