Last year, there were 80 members in a school concert club. The number of boys was
17 the number of girls.
- What percentage of the members were boys last year?
- This year, 1 girls left the club and 13 boys joined the club. What percentage of the members are boys this year?
(a)
Boys : Girls : Total
1 : 7 : 8
Percentage of members that were boys
=
18 x 100%
= 12.5%
(b)
|
Boys |
Girls |
Before |
1 u |
7 u |
Change |
+ 13 |
- 1 |
After |
1 u + 13 |
7 u - 1 |
8 u = 80
1 u = 80 ÷ 8 = 10
Number of boys this year
= 1 u + 13
= (1 x 10) + 13
= 10 + 13
= 23
Total members this year
= 80 + 13 - 1
= 92
Percentage of boys in the club
=
2392 x 100%
= 25%
Answer(s): (a) 12.5%; (b) 25%