Last year, there were 32 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, 9 boys left the club and 15 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 |
+ 15 |
- 9 |
After |
1 u + 15 |
7 u - 9 |
8 u = 32
1 u = 32 ÷ 8 = 4
Number of girls this year
= 1 u + 15
= (1 x 4) + 15
= 4 + 15
= 19
Total members this year
= 32 + 15 - 9
= 38
Percentage of girls in the club
=
1938 x 100%
= 50%
Answer(s): (a) 12.5%; (b) 50%