India and Japan took part in Youth Games. From India, the ratio of the number of male supporters to the number of female supporters was 4 : 9. From Japan, the ratio of the number of male supporters to the number of female supporters was 3 : 4. The total number of supporters from India was
1321 the total number of supporters from Japan.
- What was the ratio of the number of male supporters from India to the total number of male supporters from both countries? Express the answer in the simplest form.
- After 6 male supporters from both countries left the games, the percentage of all the female supporters became 63%. How many more female supporters from Japan than India were there at first?
India |
Japan |
13 u |
21 u |
Male supporters |
Female supporters |
Male supporters |
Female supporters |
4 |
9 |
3x3 |
4x3 |
4 u |
9 u |
9 u |
12 u |
(a)
Number of male supporters from Japan
=
37 x 21 u
= 9 u
Number of female supporters from India
=
47 x 21 u
= 12 u
Total number of male supporters
= 4 u + 9 u
= 13 u
Male supporters from India : Total male supporters
4 : 13
(b)
|
Male supporters |
Female supporters |
Before |
13x3 = 39% |
21x3 = 63% |
Change |
- 6 |
|
After |
37% |
63% |
Number of male supporters in the end in percent
= 100% - 63%
= 37%
Total number of female supporters at first
= 9 u + 12 u
= 21 u
After 6 male supporters from both countries left the games, the percentage of all the female supporters became 63%.
Since only male supporters left the games, the number of female supporters remains unchanged. Make the number of female supporters the same.
21 u = 63%
1 u = 63% ÷ 21 =
3%Number of male supporters at first in percent
= 13 x 3%
= 39%
Number of male supporters from both countries who left
= 39% - 37%
= 2%
2% = 6
1% = 6 ÷ 2 =
3Number of more female supporters from Japan than India at first
= 12 u - 9 u
= 3 u
= 3 x 3%
= 9%
= 9 x 3
= 27
Answer(s): (a) 4 : 13; (b) 27