Last year, there were 64 members in a school roadshow club. The number of girls was
17 the number of boys.
- What percentage of the members were girls last year?
- This year, 2 boys left the club and 13 girls joined the club. What percentage of the members are girls this year?
(a)
Girls : Boys : Total
1 : 7 : 8
Percentage of members that were girls
=
18 x 100%
= 12.5%
(b)
|
Girls |
Boys |
Before |
1 u |
7 u |
Change |
+ 13 |
- 2 |
After |
1 u + 13 |
7 u - 2 |
8 u = 64
1 u = 64 ÷ 8 = 8
Number of girls this year
= 1 u + 13
= (1 x 8) + 13
= 8 + 13
= 21
Total members this year
= 64 + 13 - 2
= 75
Percentage of girls in the club
=
2175 x 100%
= 28%
Answer(s): (a) 12.5%; (b) 28%