Last year, there were 68 members in a school musical play club. The number of boys was
13 the number of girls.
- What percentage of the members were boys last year?
- This year, 3 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 |
- 3 |
After |
1 u + 15 |
3 u - 3 |
4 u = 68
1 u = 68 ÷ 4 = 17
Number of boys this year
= 1 u + 15
= (1 x 17) + 15
= 17 + 15
= 32
Total members this year
= 68 + 15 - 3
= 80
Percentage of boys in the club
=
3280 x 100%
= 40%
Answer(s): (a) 25%; (b) 40%