Last year, there were 145 members in a school musical play club. The number of boys was
14 the number of girls.
- What percentage of the members were boys last year?
- This year, 8 girls left the club and 13 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 |
+ 13 |
- 8 |
After |
1 u + 13 |
4 u - 8 |
5 u = 145
1 u = 145 ÷ 5 = 29
Number of boys this year
= 1 u + 13
= (1 x 29) + 13
= 29 + 13
= 42
Total members this year
= 145 + 13 - 8
= 150
Percentage of boys in the club
=
42150 x 100%
= 28%
Answer(s): (a) 20%; (b) 28%