Last year, there were 188 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, 8 girls left the club and 10 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 |
+ 10 |
- 8 |
After |
1 u + 10 |
3 u - 8 |
4 u = 188
1 u = 188 ÷ 4 = 47
Number of boys this year
= 1 u + 10
= (1 x 47) + 10
= 47 + 10
= 57
Total members this year
= 188 + 10 - 8
= 190
Percentage of boys in the club
=
57190 x 100%
= 30%
Answer(s): (a) 25%; (b) 30%