Last year, there were 40 members in a school musical play club. The number of girls was
14 the number of boys.
- What percentage of the members were girls last year?
- This year, 10 boys left the club and 10 girls joined the club. What percentage of the members are girls this year?
(a)
Girls : Boys : Total
1 : 4 : 5
Percentage of members that were girls
=
15 x 100%
= 20%
(b)
|
Girls |
Boys |
Before |
1 u |
4 u |
Change |
+ 10 |
- 10 |
After |
1 u + 10 |
4 u - 10 |
5 u = 40
1 u = 40 ÷ 5 = 8
Number of girls this year
= 1 u + 10
= (1 x 8) + 10
= 8 + 10
= 18
Total members this year
= 40 + 10 - 10
= 40
Percentage of girls in the club
=
1840 x 100%
= 45%
Answer(s): (a) 20%; (b) 45%