PSLE
On Thursday, the number of children to women to men visiting a safari park was 1 : 10 : 4. On Friday, the number of children visiting the safari park remained the same. However, the number of women decreased by 40% and the number of men increased by 50%.

1. What was the ratio of the number of adults to children visiting the safari park on Friday?
2. On Thursday, 700 women and men visited the safari park. What was the total number of adult visitors at the safari park on Friday?

	Children	Women	Men
Before	1 u	10 u	4 u
Change		- 4 u	+ 2 u
After	1 u	6 u	6 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 Friday
= 10 u - 4 u
= 6 u

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

Number of adults on Friday
= 6 u + 6 u
= 12 u

On Friday
Adults : Children
12 : 1

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

14 u = 700

1 u = 700 ÷ 14 = 50

Total number of adult visitors on Friday
= 12 u
= 12 x 50
= 600

Answer(s): (a) 12 : 1; (b) 600