Last year, there were 72 members in a school roadshow club. The number of boys was
17 the number of girls.
- What percentage of the members were boys last year?
- This year, 6 girls left the club and 10 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 |
+ 10 |
- 6 |
After |
1 u + 10 |
7 u - 6 |
8 u = 72
1 u = 72 ÷ 8 = 9
Number of boys this year
= 1 u + 10
= (1 x 9) + 10
= 9 + 10
= 19
Total members this year
= 72 + 10 - 6
= 76
Percentage of boys in the club
=
1976 x 100%
= 25%
Answer(s): (a) 12.5%; (b) 25%