PSLE
On Thursday, the number of children to men to women visiting a park was 7 : 10 : 10. On Friday, the number of children visiting the park remained the same. However, the number of men increased by 50% and the number of women decreased by 10%.

1. What was the ratio of the number of children to men to women visiting the park on Friday?
2. On Thursday, 780 men and women visited the park. What was the total number of visitors at the park on Friday?

	Children	Men	Women
Before	7 u	10 u	10 u
Change		+ 5 u	- 1 u
After	7 u	15 u	9 u

(a)
Increase in the number of men
= 50% x 10 u
= ⁵⁰₁₀₀ x 10 u
= 5 u

Decrease in the number of women
= 10% x 10 u
= ¹⁰₁₀₀ x 10 u
= 1 u

Number of men on Friday
= 10 u + 5 u
= 15 u

Number of women on Friday
= 10 u - 1 u
= 9 u

On Friday
Children : Men : Women
7 : 15 : 9

(b)
Number of men and women on Thursday
= 10 u + 10 u
= 20 u

20 u = 780

1 u = 780 ÷ 20 = 39

Total number of visitors on Friday
= 7 u + 15 u + 9 u
= 31 u
= 31 x 39
= 1209

Answer(s): (a) 7 : 15 : 9; (b) 1209