At an event held at the stadium, 60% of the audience were adults. The female audience was made up of 20% of the adults and 90% of the children. There were 384 more girls than boys.
- How many children went to the stadium in total?
- Some women joined before the event ended, after which 20% of the remaining people at the stadium were women. How many women joined the stadium before it ended?
|
Adults |
Children |
Total |
|
3 u |
2 u |
5 u |
|
Women |
Men |
Girls |
Boys |
|
Before |
0.6 u |
2.4 u |
1.8 u |
0.2 u |
|
Change |
+ ? |
|
+ ? |
After |
|
4.4 u |
|
Comparison in the end |
1 p |
4 p |
5 p |
(a)
60% =
60100 =
35Number of women
= 20% x 3 u
=
20100 x 3 u
= 0.6 u
Number of men
= 3 u - 0.6 u
= 2.4 u
Number of girls
= 90% x 2 u
=
90100 x 2 u
= 1.8 u
Number of boys
= 2 u - 1.8 u
= 0.2 u
Number of more girls than boys
= 1.8 u - 0.2 u
= 1.6 u
1.6 u = 384
1 u = 384 ÷ 1.6 = 240
Number of children
= 2 u
= 2 x 240
= 480
(b)
20% =
20100 =
15The total number of men and children in the end is repeated.
4.4 u = 4 p
Number of men and children
= 2.4 u + 2 u
= 4.4 u
= 4.4 x 240
= 1056
4 p = 4.4 u
4 p = 1056
1 p = 1056 ÷ 4 = 264
Number of women in the end
= 1 p
= 264
Number of women at first
= 0.6 u
= 0.6 x 240
= 144
Number of women who joined before the event ended
= 264 - 144
= 120
Answers: (a) 480; (b) 120