PSLE On Monday, the number of children to men to women visiting a bird park was 3 : 10 : 10. On Tuesday, the number of children visiting the bird park remained the same. However, the number of men decreased by 50% and the number of women increased by 40%.
- What was the ratio of the number of adults to children visiting the bird park on Tuesday?
- On Monday, 580 men and women visited the bird park. What was the total number of adult visitors at the bird park on Tuesday?
|
Children |
Men |
Women |
Before |
3 u |
10 u |
10 u |
Change |
|
- 5 u |
+ 4 u |
After |
3 u |
5 u |
14 u |
(a)
Increase in the number of men
= 50% x 10 u
=
50100 x 10 u
= 5 u
Decrease in the number of women
= 40% x 10 u
=
40100 x 10 u
= 4 u
Number of men on Tuesday
= 10 u - 5 u
= 5 u
Number of women on Tuesday
= 10 u + 4 u
= 14 u
Number of adults on Tuesday
= 5 u + 14 u
= 19 u
On Tuesday
Adults : Children
19 : 3
(b)
Number of men and women on Monday
= 10 u + 10 u
= 20 u
20 u = 580
1 u = 580 ÷ 20 = 29
Total number of adult visitors on Tuesday
= 19 u
= 19 x 29
= 551
Answer(s): (a) 19 : 3; (b) 551