Last year, there were 144 members in a school concert club. The number of girls was
13 the number of boys.
- What percentage of the members were girls last year?
- This year, 9 boys left the club and 15 girls joined the club. What percentage of the members are girls this year?
(a)
Girls : Boys : Total
1 : 3 : 4
Percentage of members that were girls
=
14 x 100%
= 25%
(b)
|
Girls |
Boys |
Before |
1 u |
3 u |
Change |
+ 15 |
- 9 |
After |
1 u + 15 |
3 u - 9 |
4 u = 144
1 u = 144 ÷ 4 = 36
Number of girls this year
= 1 u + 15
= (1 x 36) + 15
= 36 + 15
= 51
Total members this year
= 144 + 15 - 9
= 150
Percentage of girls in the club
=
51150 x 100%
= 34%
Answer(s): (a) 25%; (b) 34%