PSLE
On Wednesday, the number of children to men to women visiting a bird park was 5 : 8 : 6. On Thursday, the number of children visiting the bird park remained the same. However, the number of men decreased by 25% and the number of women increased by 50%.

1. What was the ratio of the number of adults to children visiting the bird park on Thursday?
2. On Wednesday, 602 men and women visited the bird park. What was the total number of adult visitors at the bird park on Thursday?

	Children	Men	Women
Before	5 u	8 u	6 u
Change		- 2 u	+ 3 u
After	5 u	6 u	9 u

(a)
Increase in the number of men
= 25% x 8 u
= ²⁵₁₀₀ x 8 u
= 2 u

Decrease in the number of women
= 50% x 6 u
= ⁵⁰₁₀₀ x 6 u
= 3 u

Number of men on Thursday
= 8 u - 2 u
= 6 u

Number of women on Thursday
= 6 u + 3 u
= 9 u

Number of adults on Thursday
= 6 u + 9 u
= 15 u

On Thursday
Adults : Children
15 : 5

(b)
Number of men and women on Wednesday
= 8 u + 6 u
= 14 u

14 u = 602

1 u = 602 ÷ 14 = 43

Total number of adult visitors on Thursday
= 15 u
= 15 x 43
= 645

Answer(s): (a) 15 : 5; (b) 645