Last year, there were 170 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, 4 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 |
- 4 |
After |
1 u + 10 |
4 u - 4 |
5 u = 170
1 u = 170 ÷ 5 = 34
Number of boys this year
= 1 u + 10
= (1 x 34) + 10
= 34 + 10
= 44
Total members this year
= 170 + 10 - 4
= 176
Percentage of boys in the club
=
44176 x 100%
= 25%
Answer(s): (a) 20%; (b) 25%