Sweden and Korea took part in Youth Games. From Sweden, the ratio of the number of female supporters to the number of male supporters was 1 : 6. From Korea, the ratio of the number of female supporters to the number of male supporters was 1 : 5. The total number of supporters from Sweden was
718 the total number of supporters from Korea.
- What was the ratio of the number of female supporters from Sweden to the total number of female supporters from both countries? Express the answer in the simplest form.
- After another 250 female supporters from both countries joined the games, the percentage of all the male supporters became 42%. How many less male supporters from Sweden than Korea were there at first?
Sweden |
Korea |
7 u |
18 u |
Female supporters |
Male supporters |
Female supporters |
Male supporters |
1 |
6 |
1x3 |
5x3 |
1 u |
6 u |
3 u |
15 u |
(a)
Number of female supporters from Korea
=
16 x 18 u
= 3 u
Number of male supporters from Sweden
=
56 x 18 u
= 15 u
Total number of female supporters
= 1 u + 3 u
= 4 u
Female supporters from Sweden : Total female supporters
1 : 4
(b)
|
Female supporters |
Male supporters |
Before |
4x2 = 8% |
21x2 = 42% |
Change |
+ 250 |
|
After |
58% |
42% |
Number of female supporters in the end in percent
= 100% - 42%
= 58%
Total number of male supporters at first
= 6 u + 15 u
= 21 u
After another 250 female supporters from both countries joined the games, the percentage of all the male supporters became 42%.
Since only more female supporters joined the games, the number of male supporters remains unchanged. Make the number of male supporters the same.
21 u = 42%
1 u = 42% ÷ 21 =
2%Number of female supporters at first in percent
= 4 x 2%
= 8%
Number of female supporters from both countries who joined the games
= 58% - 8%
= 50%
50% = 250
1% = 250 ÷ 50 =
5Number of less male supporters from Sweden than Korea at first
= 15 u - 6 u
= 9 u
= 9 x 2%
= 18%
= 18 x 5
= 90
Answer(s): (a) 1 : 4; (b) 90