PSLE
On Thursday, the number of children to women to men visiting a safari park was 7 : 8 : 5. On Friday, the number of children visiting the safari park remained the same. However, the number of women decreased by 50% and the number of men increased by 40%.

1. What was the ratio of the number of adults to children visiting the safari park on Friday?
2. On Thursday, 481 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	7 u	8 u	5 u
Change		- 4 u	+ 2 u
After	7 u	4 u	7 u

(a)
Increase in the number of women
= 50% x 8 u
= ⁵⁰₁₀₀ x 8 u
= 4 u

Decrease in the number of men
= 40% x 5 u
= ⁴⁰₁₀₀ x 5 u
= 2 u

Number of women on Friday
= 8 u - 4 u
= 4 u

Number of men on Friday
= 5 u + 2 u
= 7 u

Number of adults on Friday
= 4 u + 7 u
= 11 u

On Friday
Adults : Children
11 : 7

(b)
Number of women and men on Thursday
= 8 u + 5 u
= 13 u

13 u = 481

1 u = 481 ÷ 13 = 37

Total number of adult visitors on Friday
= 11 u
= 11 x 37
= 407

Answer(s): (a) 11 : 7; (b) 407