Last year, there were 185 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, 10 girls left the club and 9 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 |
+ 9 |
- 10 |
After |
1 u + 9 |
4 u - 10 |
5 u = 185
1 u = 185 ÷ 5 = 37
Number of boys this year
= 1 u + 9
= (1 x 37) + 9
= 37 + 9
= 46
Total members this year
= 185 + 9 - 10
= 184
Percentage of boys in the club
=
46184 x 100%
= 25%
Answer(s): (a) 20%; (b) 25%