Last year, there were 92 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, 7 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 |
- 7 |
After |
1 u + 15 |
3 u - 7 |
4 u = 92
1 u = 92 ÷ 4 = 23
Number of girls this year
= 1 u + 15
= (1 x 23) + 15
= 23 + 15
= 38
Total members this year
= 92 + 15 - 7
= 100
Percentage of girls in the club
=
38100 x 100%
= 38%
Answer(s): (a) 25%; (b) 38%