PSLE On Saturday, the number of children to women to men visiting a bird park was 5 : 12 : 10. On Sunday, the number of children visiting the bird park remained the same. However, the number of women decreased by 25% and the number of men increased by 40%.
- What was the ratio of the number of adults to children visiting the bird park on Sunday?
- On Saturday, 550 women and men visited the bird park. What was the total number of adult visitors at the bird park on Sunday?
|
Children |
Women |
Men |
Before |
5 u |
12 u |
10 u |
Change |
|
- 3 u |
+ 4 u |
After |
5 u |
9 u |
14 u |
(a)
Increase in the number of women
= 25% x 12 u
=
25100 x 12 u
= 3 u
Decrease in the number of men
= 40% x 10 u
=
40100 x 10 u
= 4 u
Number of women on Sunday
= 12 u - 3 u
= 9 u
Number of men on Sunday
= 10 u + 4 u
= 14 u
Number of adults on Sunday
= 9 u + 14 u
= 23 u
On Sunday
Adults : Children
23 : 5
(b)
Number of women and men on Saturday
= 12 u + 10 u
= 22 u
22 u = 550
1 u = 550 ÷ 22 = 25
Total number of adult visitors on Sunday
= 23 u
= 23 x 25
= 575
Answer(s): (a) 23 : 5; (b) 575