Last year, there were 60 members in a school circus show 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 13 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 |
+ 13 |
- 3 |
After |
1 u + 13 |
3 u - 3 |
4 u = 60
1 u = 60 ÷ 4 = 15
Number of boys this year
= 1 u + 13
= (1 x 15) + 13
= 15 + 13
= 28
Total members this year
= 60 + 13 - 3
= 70
Percentage of boys in the club
=
2870 x 100%
= 40%
Answer(s): (a) 25%; (b) 40%