PSLE On Wednesday, the number of children to men to women visiting a fun fair was 7 : 5 : 4. On Thursday, the number of children visiting the fun fair remained the same. However, the number of men decreased by 20% and the number of women increased by 50%.
- What was the ratio of the number of adults to children visiting the fun fair on Thursday?
- On Wednesday, 414 men and women visited the fun fair. What was the total number of adult visitors at the fun fair on Thursday?
|
Children |
Men |
Women |
Before |
7 u |
5 u |
4 u |
Change |
|
- 1 u |
+ 2 u |
After |
7 u |
4 u |
6 u |
(a)
Increase in the number of men
= 20% x 5 u
=
20100 x 5 u
= 1 u
Decrease in the number of women
= 50% x 4 u
=
50100 x 4 u
= 2 u
Number of men on Thursday
= 5 u - 1 u
= 4 u
Number of women on Thursday
= 4 u + 2 u
= 6 u
Number of adults on Thursday
= 4 u + 6 u
= 10 u
On Thursday
Adults : Children
10 : 7
(b)
Number of men and women on Wednesday
= 5 u + 4 u
= 9 u
9 u = 414
1 u = 414 ÷ 9 = 46
Total number of adult visitors on Thursday
= 10 u
= 10 x 46
= 460
Answer(s): (a) 10 : 7; (b) 460