PSLE On Monday, the number of children to men to women visiting a safari park was 1 : 10 : 5. On Tuesday, the number of children visiting the safari park remained the same. However, the number of men increased by 50% and the number of women decreased by 20%.
- What was the ratio of the number of children to men to women visiting the safari park on Tuesday?
- On Monday, 435 men and women visited the safari park. What was the total number of visitors at the safari park on Tuesday?
|
Children |
Men |
Women |
Before |
1 u |
10 u |
5 u |
Change |
|
+ 5 u |
- 1 u |
After |
1 u |
15 u |
4 u |
(a)
Increase in the number of men
= 50% x 10 u
=
50100 x 10 u
= 5 u
Decrease in the number of women
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of men on Tuesday
= 10 u + 5 u
= 15 u
Number of women on Tuesday
= 5 u - 1 u
= 4 u
On Tuesday
Children : Men : Women
1 : 15 : 4
(b)
Number of men and women on Monday
= 10 u + 5 u
= 15 u
15 u = 435
1 u = 435 ÷ 15 = 29
Total number of visitors on Tuesday
= 1 u + 15 u + 4 u
= 20 u
= 20 x 29
= 580
Answer(s): (a) 1 : 15 : 4; (b) 580