Last year, there were 35 members in a school concert club. The number of girls was
14 the number of boys.
- What percentage of the members were girls last year?
- This year, 8 boys left the club and 13 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 |
+ 13 |
- 8 |
After |
1 u + 13 |
4 u - 8 |
5 u = 35
1 u = 35 ÷ 5 = 7
Number of girls this year
= 1 u + 13
= (1 x 7) + 13
= 7 + 13
= 20
Total members this year
= 35 + 13 - 8
= 40
Percentage of girls in the club
=
2040 x 100%
= 50%
Answer(s): (a) 20%; (b) 50%