PSLE
On Monday, the number of children to women to men visiting a safari park was 5 : 5 : 4. On Tuesday, the number of children visiting the safari park remained the same. However, the number of women decreased by 20% and the number of men increased by 25%.

1. What was the ratio of the number of adults to children visiting the safari park on Tuesday?
2. On Monday, 333 women and men visited the safari park. What was the total number of adult visitors at the safari park on Tuesday?

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

(a)
Increase in the number of women
= 20% x 5 u
= ²⁰₁₀₀ x 5 u
= 1 u

Decrease in the number of men
= 25% x 4 u
= ²⁵₁₀₀ x 4 u
= 1 u

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

Number of men on Tuesday
= 4 u + 1 u
= 5 u

Number of adults on Tuesday
= 4 u + 5 u
= 9 u

On Tuesday
Adults : Children
9 : 5

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

9 u = 333

1 u = 333 ÷ 9 = 37

Total number of adult visitors on Tuesday
= 9 u
= 9 x 37
= 333

Answer(s): (a) 9 : 5; (b) 333