Last year, there were 112 members in a school musical play club. The number of boys was
17 the number of girls.
- What percentage of the members were boys last year?
- This year, 2 girls left the club and 10 boys joined the club. What percentage of the members are boys this year?
(a)
Boys : Girls : Total
1 : 7 : 8
Percentage of members that were boys
=
18 x 100%
= 12.5%
(b)
|
Boys |
Girls |
Before |
1 u |
7 u |
Change |
+ 10 |
- 2 |
After |
1 u + 10 |
7 u - 2 |
8 u = 112
1 u = 112 ÷ 8 = 14
Number of boys this year
= 1 u + 10
= (1 x 14) + 10
= 14 + 10
= 24
Total members this year
= 112 + 10 - 2
= 120
Percentage of boys in the club
=
24120 x 100%
= 20%
Answer(s): (a) 12.5%; (b) 20%