PSLE
On Monday, the number of children to men to women visiting a fun fair was 3 : 12 : 5. On Tuesday, the number of children visiting the fun fair remained the same. However, the number of men decreased by 25% and the number of women increased by 20%.

1. What was the ratio of the number of adults to children visiting the fun fair on Tuesday?
2. On Monday, 833 men and women visited the fun fair. What was the total number of adult visitors at the fun fair on Tuesday?

	Children	Men	Women
Before	3 u	12 u	5 u
Change		- 3 u	+ 1 u
After	3 u	9 u	6 u

(a)
Increase in the number of men
= 25% x 12 u
= ²⁵₁₀₀ x 12 u
= 3 u

Decrease in the number of women
= 20% x 5 u
= ²⁰₁₀₀ x 5 u
= 1 u

Number of men on Tuesday
= 12 u - 3 u
= 9 u

Number of women on Tuesday
= 5 u + 1 u
= 6 u

Number of adults on Tuesday
= 9 u + 6 u
= 15 u

On Tuesday
Adults : Children
15 : 3

(b)
Number of men and women on Monday
= 12 u + 5 u
= 17 u

17 u = 833

1 u = 833 ÷ 17 = 49

Total number of adult visitors on Tuesday
= 15 u
= 15 x 49
= 735

Answer(s): (a) 15 : 3; (b) 735