PSLE
On Tuesday, the number of children to women to men visiting a bird park was 7 : 5 : 6. On Wednesday, the number of children visiting the bird 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 bird park on Wednesday?
2. On Tuesday, 363 women and men visited the bird park. What was the total number of adult visitors at the bird park on Wednesday?

	Children	Women	Men
Before	7 u	5 u	6 u
Change		- 2 u	+ 3 u
After	7 u	3 u	9 u

(a)
Increase in the number of women
= 40% x 5 u
= ⁴⁰₁₀₀ x 5 u
= 2 u

Decrease in the number of men
= 50% x 6 u
= ⁵⁰₁₀₀ x 6 u
= 3 u

Number of women on Wednesday
= 5 u - 2 u
= 3 u

Number of men on Wednesday
= 6 u + 3 u
= 9 u

Number of adults on Wednesday
= 3 u + 9 u
= 12 u

On Wednesday
Adults : Children
12 : 7

(b)
Number of women and men on Tuesday
= 5 u + 6 u
= 11 u

11 u = 363

1 u = 363 ÷ 11 = 33

Total number of adult visitors on Wednesday
= 12 u
= 12 x 33
= 396

Answer(s): (a) 12 : 7; (b) 396