PSLE
On Thursday, the number of children to men to women visiting a safari park was 1 : 5 : 10. On Friday, the number of children visiting the safari park remained the same. However, the number of men increased by 20% and the number of women decreased by 50%.

1. What was the ratio of the number of children to men to women visiting the safari park on Friday?
2. On Thursday, 390 men and women visited the safari park. What was the total number of visitors at the safari park on Friday?

	Children	Men	Women
Before	1 u	5 u	10 u
Change		+ 1 u	- 5 u
After	1 u	6 u	5 u

(a)
Increase in the number of men
= 20% x 5 u
= ²⁰₁₀₀ x 5 u
= 1 u

Decrease in the number of women
= 50% x 10 u
= ⁵⁰₁₀₀ x 10 u
= 5 u

Number of men on Friday
= 5 u + 1 u
= 6 u

Number of women on Friday
= 10 u - 5 u
= 5 u

On Friday
Children : Men : Women
1 : 6 : 5

(b)
Number of men and women on Thursday
= 5 u + 10 u
= 15 u

15 u = 390

1 u = 390 ÷ 15 = 26

Total number of visitors on Friday
= 1 u + 6 u + 5 u
= 12 u
= 12 x 26
= 312

Answer(s): (a) 1 : 6 : 5; (b) 312