Last year, there were 36 members in a school musical play club. The number of girls was
13 the number of boys.
- What percentage of the members were girls last year?
- This year, 6 boys left the club and 12 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 |
+ 12 |
- 6 |
After |
1 u + 12 |
3 u - 6 |
4 u = 36
1 u = 36 ÷ 4 = 9
Number of girls this year
= 1 u + 12
= (1 x 9) + 12
= 9 + 12
= 21
Total members this year
= 36 + 12 - 6
= 42
Percentage of girls in the club
=
2142 x 100%
= 50%
Answer(s): (a) 25%; (b) 50%