PSLE
On Tuesday, the number of children to men to women visiting a safari park was 7 : 5 : 8. On Wednesday, the number of children visiting the safari park remained the same. However, the number of men decreased by 20% and the number of women increased by 50%.

1. What was the ratio of the number of adults to children visiting the safari park on Wednesday?
2. On Tuesday, 338 men and women visited the safari park. What was the total number of adult visitors at the safari park on Wednesday?

	Children	Men	Women
Before	7 u	5 u	8 u
Change		- 1 u	+ 4 u
After	7 u	4 u	12 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 8 u
= ⁵⁰₁₀₀ x 8 u
= 4 u

Number of men on Wednesday
= 5 u - 1 u
= 4 u

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

Number of adults on Wednesday
= 4 u + 12 u
= 16 u

On Wednesday
Adults : Children
16 : 7

(b)
Number of men and women on Tuesday
= 5 u + 8 u
= 13 u

13 u = 338

1 u = 338 ÷ 13 = 26

Total number of adult visitors on Wednesday
= 16 u
= 16 x 26
= 416

Answer(s): (a) 16 : 7; (b) 416