Last year, there were 84 members in a school circus show club. The number of boys was
13 the number of girls.
- What percentage of the members were boys last year?
- This year, 9 girls left the club and 15 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 |
+ 15 |
- 9 |
After |
1 u + 15 |
3 u - 9 |
4 u = 84
1 u = 84 ÷ 4 = 21
Number of boys this year
= 1 u + 15
= (1 x 21) + 15
= 21 + 15
= 36
Total members this year
= 84 + 15 - 9
= 90
Percentage of boys in the club
=
3690 x 100%
= 40%
Answer(s): (a) 25%; (b) 40%