PSLE
On Monday, the number of children to women to men visiting a zoo was 3 : 10 : 4. On Tuesday, the number of children visiting the zoo remained the same. However, the number of women increased by 40% and the number of men decreased by 50%.

1. What was the ratio of the number of children to women to men visiting the zoo on Tuesday?
2. On Monday, 406 women and men visited the zoo. What was the total number of visitors at the zoo on Tuesday?

	Children	Women	Men
Before	3 u	10 u	4 u
Change		+ 4 u	- 2 u
After	3 u	14 u	2 u

(a)
Increase in the number of women
= 40% x 10 u
= ⁴⁰₁₀₀ x 10 u
= 4 u

Decrease in the number of men
= 50% x 4 u
= ⁵⁰₁₀₀ x 4 u
= 2 u

Number of women on Tuesday
= 10 u + 4 u
= 14 u

Number of men on Tuesday
= 4 u - 2 u
= 2 u

On Tuesday
Children : Women : Men
3 : 14 : 2

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

14 u = 406

1 u = 406 ÷ 14 = 29

Total number of visitors on Tuesday
= 3 u + 14 u + 2 u
= 19 u
= 19 x 29
= 551

Answer(s): (a) 3 : 14 : 2; (b) 551