Last year, there were 35 members in a school circus show 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 15 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 |
+ 15 |
- 10 |
After |
1 u + 15 |
4 u - 10 |
5 u = 35
1 u = 35 ÷ 5 = 7
Number of boys this year
= 1 u + 15
= (1 x 7) + 15
= 7 + 15
= 22
Total members this year
= 35 + 15 - 10
= 40
Percentage of boys in the club
=
2240 x 100%
= 55%
Answer(s): (a) 20%; (b) 55%