PSLE
On Monday, the number of children to men to women visiting a zoo was 5 : 4 : 5. On Tuesday, the number of children visiting the zoo remained the same. However, the number of men increased by 50% and the number of women decreased by 20%.

1. What was the ratio of the number of children to men to women visiting the zoo on Tuesday?
2. On Monday, 225 men and women visited the zoo. What was the total number of visitors at the zoo on Tuesday?

	Children	Men	Women
Before	5 u	4 u	5 u
Change		+ 2 u	- 1 u
After	5 u	6 u	4 u

(a)
Increase in the number of men
= 50% x 4 u
= ⁵⁰₁₀₀ x 4 u
= 2 u

Decrease in the number of women
= 20% x 5 u
= ²⁰₁₀₀ x 5 u
= 1 u

Number of men on Tuesday
= 4 u + 2 u
= 6 u

Number of women on Tuesday
= 5 u - 1 u
= 4 u

On Tuesday
Children : Men : Women
5 : 6 : 4

(b)
Number of men and women on Monday
= 4 u + 5 u
= 9 u

9 u = 225

1 u = 225 ÷ 9 = 25

Total number of visitors on Tuesday
= 5 u + 6 u + 4 u
= 15 u
= 15 x 25
= 375

Answer(s): (a) 5 : 6 : 4; (b) 375