PSLE On Thursday, the number of children to women to men visiting a safari park was 7 : 5 : 5. On Friday, the number of children visiting the safari park remained the same. However, the number of women decreased by 20% and the number of men increased by 20%.
- What was the ratio of the number of adults to children visiting the safari park on Friday?
- On Thursday, 370 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 |
7 u |
5 u |
5 u |
Change |
|
- 1 u |
+ 1 u |
After |
7 u |
4 u |
6 u |
(a)
Increase in the number of women
= 20% x 5 u
=
20100 x 5 u
= 1 u
Decrease in the number of men
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of women on Friday
= 5 u - 1 u
= 4 u
Number of men on Friday
= 5 u + 1 u
= 6 u
Number of adults on Friday
= 4 u + 6 u
= 10 u
On Friday
Adults : Children
10 : 7
(b)
Number of women and men on Thursday
= 5 u + 5 u
= 10 u
10 u = 370
1 u = 370 ÷ 10 = 37
Total number of adult visitors on Friday
= 10 u
= 10 x 37
= 370
Answer(s): (a) 10 : 7; (b) 370