Last year, there were 40 members in a school concert club. The number of boys was
35 the number of girls.
- What percentage of the members were boys last year?
- This year, 3 girls left the club and 13 boys joined the club. What percentage of the members are boys this year?
(a)
Boys : Girls : Total
3 : 5 : 8
Percentage of members that were boys
=
38 x 100%
= 37.5%
(b)
|
Boys |
Girls |
Before |
3 u |
5 u |
Change |
+ 13 |
- 3 |
After |
3 u + 13 |
5 u - 3 |
8 u = 40
1 u = 40 ÷ 8 = 5
Number of boys this year
= 3 u + 13
= (3 x 5) + 13
= 15 + 13
= 28
Total members this year
= 40 + 13 - 3
= 50
Percentage of boys in the club
=
2850 x 100%
= 56%
Answer(s): (a) 37.5%; (b) 56%