Last year, there were 48 members in a school circus show club. The number of girls was
17 the number of boys.
- What percentage of the members were girls last year?
- This year, 7 boys left the club and 9 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 |
+ 9 |
- 7 |
After |
1 u + 9 |
7 u - 7 |
8 u = 48
1 u = 48 ÷ 8 = 6
Number of girls this year
= 1 u + 9
= (1 x 6) + 9
= 6 + 9
= 15
Total members this year
= 48 + 9 - 7
= 50
Percentage of girls in the club
=
1550 x 100%
= 30%
Answer(s): (a) 12.5%; (b) 30%