PSLE On Saturday, the number of children to women to men visiting a bird park was 7 : 10 : 10. On Sunday, 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 10%.
- What was the ratio of the number of adults to children visiting the bird park on Sunday?
- On Saturday, 500 women and men visited the bird park. What was the total number of adult visitors at the bird park on Sunday?
|
Children |
Women |
Men |
Before |
7 u |
10 u |
10 u |
Change |
|
- 4 u |
+ 1 u |
After |
7 u |
6 u |
11 u |
(a)
Increase in the number of women
= 40% x 10 u
=
40100 x 10 u
= 4 u
Decrease in the number of men
= 10% x 10 u
=
10100 x 10 u
= 1 u
Number of women on Sunday
= 10 u - 4 u
= 6 u
Number of men on Sunday
= 10 u + 1 u
= 11 u
Number of adults on Sunday
= 6 u + 11 u
= 17 u
On Sunday
Adults : Children
17 : 7
(b)
Number of women and men on Saturday
= 10 u + 10 u
= 20 u
20 u = 500
1 u = 500 ÷ 20 = 25
Total number of adult visitors on Sunday
= 17 u
= 17 x 25
= 425
Answer(s): (a) 17 : 7; (b) 425