Last year, there were 145 members in a school concert club. The number of boys was
14 the number of girls.
- What percentage of the members were boys last year?
- This year, 5 girls left the club and 10 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 |
+ 10 |
- 5 |
After |
1 u + 10 |
4 u - 5 |
5 u = 145
1 u = 145 ÷ 5 = 29
Number of boys this year
= 1 u + 10
= (1 x 29) + 10
= 29 + 10
= 39
Total members this year
= 145 + 10 - 5
= 150
Percentage of boys in the club
=
39150 x 100%
= 26%
Answer(s): (a) 20%; (b) 26%