Last year, there were 72 members in a school roadshow club. The number of boys was
13 the number of girls.
- What percentage of the members were boys last year?
- This year, 6 girls left the club and 9 boys joined the club. What percentage of the members are boys this year?
(a)
Boys : Girls : Total
1 : 3 : 4
Percentage of members that were boys
=
14 x 100%
= 25%
(b)
|
Boys |
Girls |
Before |
1 u |
3 u |
Change |
+ 9 |
- 6 |
After |
1 u + 9 |
3 u - 6 |
4 u = 72
1 u = 72 ÷ 4 = 18
Number of boys this year
= 1 u + 9
= (1 x 18) + 9
= 18 + 9
= 27
Total members this year
= 72 + 9 - 6
= 75
Percentage of boys in the club
=
2775 x 100%
= 36%
Answer(s): (a) 25%; (b) 36%