PSLE On Thursday, the number of children to women to men visiting a safari park was 5 : 4 : 4. On Friday, the number of children visiting the safari park remained the same. However, the number of women decreased by 50% and the number of men increased by 50%.
- What was the ratio of the number of adults to children visiting the safari park on Friday?
- On Thursday, 280 women and men visited the safari park. What was the total number of adult visitors at the safari park on Friday?
|
Children |
Women |
Men |
Before |
5 u |
4 u |
4 u |
Change |
|
- 2 u |
+ 2 u |
After |
5 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
= 50% x 4 u
=
50100 x 4 u
= 2 u
Number of women on Friday
= 4 u - 2 u
= 2 u
Number of men on Friday
= 4 u + 2 u
= 6 u
Number of adults on Friday
= 2 u + 6 u
= 8 u
On Friday
Adults : Children
8 : 5
(b)
Number of women and men on Thursday
= 4 u + 4 u
= 8 u
8 u = 280
1 u = 280 ÷ 8 = 35
Total number of adult visitors on Friday
= 8 u
= 8 x 35
= 280
Answer(s): (a) 8 : 5; (b) 280