PSLE
On Thursday, the number of children to women to men visiting a safari park was 1 : 8 : 2. On Friday, the number of children visiting the safari park remained the same. However, the number of women increased by 50% and the number of men decreased by 50%.

1. What was the ratio of the number of children to women to men visiting the safari park on Friday?
2. On Thursday, 220 women and men visited the safari park. What was the total number of visitors at the safari park on Friday?

	Children	Women	Men
Before	1 u	8 u	2 u
Change		+ 4 u	- 1 u
After	1 u	12 u	1 u

(a)
Increase in the number of women
= 50% x 8 u
= ⁵⁰₁₀₀ x 8 u
= 4 u

Decrease in the number of men
= 50% x 2 u
= ⁵⁰₁₀₀ x 2 u
= 1 u

Number of women on Friday
= 8 u + 4 u
= 12 u

Number of men on Friday
= 2 u - 1 u
= 1 u

On Friday
Children : Women : Men
1 : 12 : 1

(b)
Number of women and men on Thursday
= 8 u + 2 u
= 10 u

10 u = 220

1 u = 220 ÷ 10 = 22

Total number of visitors on Friday
= 1 u + 12 u + 1 u
= 14 u
= 14 x 22
= 308

Answer(s): (a) 1 : 12 : 1; (b) 308