Last year, there were 200 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, 9 boys left the club and 9 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 |
+ 9 |
- 9 |
After |
3 u + 9 |
5 u - 9 |
8 u = 200
1 u = 200 ÷ 8 = 25
Number of girls this year
= 3 u + 9
= (3 x 25) + 9
= 75 + 9
= 84
Total members this year
= 200 + 9 - 9
= 200
Percentage of girls in the club
=
84200 x 100%
= 42%
Answer(s): (a) 37.5%; (b) 42%