Australia and Scotland took part in Youth Games. From Australia, the ratio of the number of male supporters to the number of female supporters was 2 : 11. From Scotland, the ratio of the number of male supporters to the number of female supporters was 3 : 5. The total number of supporters from Australia was
1324 the total number of supporters from Scotland.
- What was the ratio of the number of male supporters from Australia to the total number of male supporters from both countries? Express the answer in the simplest form.
- After another 260 male supporters from both countries joined the games, the percentage of all the female supporters became 52%. How many less female supporters from Australia than Scotland were there at first?
Australia |
Scotland |
13 u |
24 u |
Male supporters |
Female supporters |
Male supporters |
Female supporters |
2 |
11 |
3x3 |
5x3 |
2 u |
11 u |
9 u |
15 u |
(a)
Number of male supporters from Scotland
=
38 x 24 u
= 9 u
Number of female supporters from Australia
=
58 x 24 u
= 15 u
Total number of male supporters
= 2 u + 9 u
= 11 u
Male supporters from Australia : Total male supporters
2 : 11
(b)
|
Male supporters |
Female supporters |
Before |
11x2 = 22% |
26x2 = 52% |
Change |
+ 260 |
|
After |
48% |
52% |
Number of male supporters in the end in percent
= 100% - 52%
= 48%
Total number of female supporters at first
= 11 u + 15 u
= 26 u
After another 260 male supporters from both countries joined the games, the percentage of all the female supporters became 52%.
Since only more male supporters joined the games, the number of female supporters remains unchanged. Make the number of female supporters the same.
26 u = 52%
1 u = 52% ÷ 26 =
2%Number of male supporters at first in percent
= 11 x 2%
= 22%
Number of male supporters from both countries who joined the games
= 48% - 22%
= 26%
26% = 260
1% = 260 ÷ 26 =
10Number of less female supporters from Australia than Scotland at first
= 15 u - 11 u
= 4 u
= 4 x 2%
= 8%
= 8 x 10
= 80
Answer(s): (a) 2 : 11; (b) 80