PSLE
On Tuesday, the number of children to women to men visiting a bird park was 1 : 4 : 10. On Wednesday, the number of children visiting the bird park remained the same. However, the number of women increased by 25% and the number of men decreased by 10%.

1. What was the ratio of the number of children to women to men visiting the bird park on Wednesday?
2. On Tuesday, 504 women and men visited the bird park. What was the total number of visitors at the bird park on Wednesday?

	Children	Women	Men
Before	1 u	4 u	10 u
Change		+ 1 u	- 1 u
After	1 u	5 u	9 u

(a)
Increase in the number of women
= 25% x 4 u
= ²⁵₁₀₀ x 4 u
= 1 u

Decrease in the number of men
= 10% x 10 u
= ¹⁰₁₀₀ x 10 u
= 1 u

Number of women on Wednesday
= 4 u + 1 u
= 5 u

Number of men on Wednesday
= 10 u - 1 u
= 9 u

On Wednesday
Children : Women : Men
1 : 5 : 9

(b)
Number of women and men on Tuesday
= 4 u + 10 u
= 14 u

14 u = 504

1 u = 504 ÷ 14 = 36

Total number of visitors on Wednesday
= 1 u + 5 u + 9 u
= 15 u
= 15 x 36
= 540

Answer(s): (a) 1 : 5 : 9; (b) 540