Norway and Vietnam took part in Youth Games. From Norway, the ratio of the number of male supporters to the number of female supporters was 4 : 7. From Vietnam, the ratio of the number of male supporters to the number of female supporters was 1 : 5. The total number of supporters from Norway was
1118 the total number of supporters from Vietnam.
- What was the ratio of the number of male supporters from Norway to the total number of male supporters from both countries? Express the answer in the simplest form.
- After another 462 male supporters from both countries joined the games, the percentage of all the female supporters became 44%. How many less female supporters from Norway than Vietnam were there at first?
Norway |
Vietnam |
11 u |
18 u |
Male supporters |
Female supporters |
Male supporters |
Female supporters |
4 |
7 |
1x3 |
5x3 |
4 u |
7 u |
3 u |
15 u |
(a)
Number of male supporters from Vietnam
=
16 x 18 u
= 3 u
Number of female supporters from Norway
=
56 x 18 u
= 15 u
Total number of male supporters
= 4 u + 3 u
= 7 u
Male supporters from Norway : Total male supporters
4 : 7
(b)
|
Male supporters |
Female supporters |
Before |
7x2 = 14% |
22x2 = 44% |
Change |
+ 462 |
|
After |
56% |
44% |
Number of male supporters in the end in percent
= 100% - 44%
= 56%
Total number of female supporters at first
= 7 u + 15 u
= 22 u
After another 462 male supporters from both countries joined the games, the percentage of all the female supporters became 44%.
Since only more male supporters joined the games, the number of female supporters remains unchanged. Make the number of female supporters the same.
22 u = 44%
1 u = 44% ÷ 22 =
2%Number of male supporters at first in percent
= 7 x 2%
= 14%
Number of male supporters from both countries who joined the games
= 56% - 14%
= 42%
42% = 462
1% = 462 ÷ 42 =
11Number of less female supporters from Norway than Vietnam at first
= 15 u - 7 u
= 8 u
= 8 x 2%
= 16%
= 16 x 11
= 176
Answer(s): (a) 4 : 7; (b) 176