PSLE
On Friday, the number of children to men to women visiting a fun fair was 3 : 5 : 8. On Saturday, the number of children visiting the fun fair remained the same. However, the number of men decreased by 40% and the number of women increased by 50%.

1. What was the ratio of the number of adults to children visiting the fun fair on Saturday?
2. On Friday, 611 men and women visited the fun fair. What was the total number of adult visitors at the fun fair on Saturday?

	Children	Men	Women
Before	3 u	5 u	8 u
Change		- 2 u	+ 4 u
After	3 u	3 u	12 u

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

Decrease in the number of women
= 50% x 8 u
= ⁵⁰₁₀₀ x 8 u
= 4 u

Number of men on Saturday
= 5 u - 2 u
= 3 u

Number of women on Saturday
= 8 u + 4 u
= 12 u

Number of adults on Saturday
= 3 u + 12 u
= 15 u

On Saturday
Adults : Children
15 : 3

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

13 u = 611

1 u = 611 ÷ 13 = 47

Total number of adult visitors on Saturday
= 15 u
= 15 x 47
= 705

Answer(s): (a) 15 : 3; (b) 705