Last year, there were 30 members in a school roadshow club. The number of boys was
14 the number of girls.
- What percentage of the members were boys last year?
- This year, 6 girls left the club and 12 boys joined the club. What percentage of the members are boys this year?
(a)
Boys : Girls : Total
1 : 4 : 5
Percentage of members that were boys
=
15 x 100%
= 20%
(b)
|
Boys |
Girls |
Before |
1 u |
4 u |
Change |
+ 12 |
- 6 |
After |
1 u + 12 |
4 u - 6 |
5 u = 30
1 u = 30 ÷ 5 = 6
Number of boys this year
= 1 u + 12
= (1 x 6) + 12
= 6 + 12
= 18
Total members this year
= 30 + 12 - 6
= 36
Percentage of boys in the club
=
1836 x 100%
= 50%
Answer(s): (a) 20%; (b) 50%