PSLE On Monday, the number of children to women to men visiting a bird park was 3 : 4 : 5. On Tuesday, the number of children visiting the bird park remained the same. However, the number of women decreased by 50% and the number of men increased by 20%.
- What was the ratio of the number of adults to children visiting the bird park on Tuesday?
- On Monday, 207 women and men visited the bird park. What was the total number of adult visitors at the bird park on Tuesday?
|
Children |
Women |
Men |
Before |
3 u |
4 u |
5 u |
Change |
|
- 2 u |
+ 1 u |
After |
3 u |
2 u |
6 u |
(a)
Increase in the number of women
= 50% x 4 u
=
50100 x 4 u
= 2 u
Decrease in the number of men
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of women on Tuesday
= 4 u - 2 u
= 2 u
Number of men on Tuesday
= 5 u + 1 u
= 6 u
Number of adults on Tuesday
= 2 u + 6 u
= 8 u
On Tuesday
Adults : Children
8 : 3
(b)
Number of women and men on Monday
= 4 u + 5 u
= 9 u
9 u = 207
1 u = 207 ÷ 9 = 23
Total number of adult visitors on Tuesday
= 8 u
= 8 x 23
= 184
Answer(s): (a) 8 : 3; (b) 184