PSLE On Friday, the number of adults to boys to girls visiting a fun fair was 5 : 4 : 10. On Saturday, the number of adults visiting the fun fair remained the same. However, the number of boys decreased by 25% and the number of girls increased by 50%.
- What was the ratio of the number of children to adults visiting the fun fair on Saturday?
- On Friday, 532 boys and girls visited the fun fair. What was the total number of child visitors at the fun fair on Saturday?
|
Adults |
Boys |
Girls |
Before |
5 u |
4 u |
10 u |
Change |
|
- 1 u |
+ 5 u |
After |
5 u |
3 u |
15 u |
(a)
Increase in the number of boys
= 25% x 4 u
=
25100 x 4 u
= 1 u
Decrease in the number of girls
= 50% x 10 u
=
50100 x 10 u
= 5 u
Number of boys on Saturday
= 4 u - 1 u
= 3 u
Number of girls on Saturday
= 10 u + 5 u
= 15 u
Number of children on Saturday
= 3 u + 15 u
= 18 u
On Saturday
Children : Adults
18 : 5
(b)
Number of boys and girls on Friday
= 4 u + 10 u
= 14 u
14 u = 532
1 u = 532 ÷ 14 = 38
Total number of child visitors on Saturday
= 18 u
= 18 x 38
= 684
Answer(s): (a) 18 : 5; (b) 684